Which best describes the structure of actin filaments?

Flexible, inextensible helical filament

What are the function(s) of actin filaments?

Provide mechanical support, allow movement

What role does surface area-to-volume ratio play in cell size?

Ensures fast resource/waste exchange

What is the structure of ribosomes?

Particles composed of protein and RNA molecules

What are the function(s) of Golgi apparatus?

Transport materials throughout the cell

What is a cell organelle?

A specialized structure within a cell that performs distinct processes

Which function is associated with the plasma membrane?

Regulates cell interaction and protection

How do temperature changes affect enzyme activity?

Molecules move faster at higher temperatures

What are enzymes, and what role do they play in biological reactions?

Proteins that speed up chemical reactions in cells

What is the structure of nucleus?

Nuclear envelope, pores, chromosomes, nucleolus

Why are cell organelles essential for cells?

They perform tasks crucial for cellular health

What is the structure of lysosomes?

Membrane sac of digestive enzymes

Compare and contrast prokaryotic and eukaryotic cells.

Prokaryotes lack nucleus; eukaryotes have nucleus

What is the function(s) of flagella?

Helps the prokaryotic cell move

What is the structure of cilia?

Small, slender, hair-like structures

What is the role of nuclear pores?

Allow RNA and proteins to pass in and out of nucleus

How do reaction graphs depict energy changes in reactions?

Up/down with activation energy “hump”

What is the primary difference between plant and animal cells?

Plant cells have cell walls; animal cells do not

How does the fluid mosaic model describe the plasma membrane?

Lipids and proteins move laterally in a fluid structure

What distinguishes eukaryotic cells that can be multicellular?

They have membrane-bound organelles

How do eukaryotic cells achieve compartmentalization?

Through internal membranes and organelles

What are the function(s) of Smooth Endoplasmic Reticulum?

Synthesis and storage of lipids

What organisms are classified as prokaryotes and eukaryotes?

Bacteria are prokaryotes; humans are eukaryotes

How can graphical representations help in understanding enzyme concentration and reaction rates?

Show enzymes’ effect on activation energy

How does increasing enzyme concentration lower activation energy?

Reduces energy needed for reactants to meet

What are the function(s) of plasmodesmata?

Channel for transport in/out of plant cells

What are the function(s) of nuclear pores?

Allow RNA/proteins to pass in/out of nucleus

What are the three parts of the cytoskeleton?

Microtubules, microfilaments, intermediate filaments

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Questions 129

Answers

1
Which best describes the structure of actin filaments?
Nine triplets of microtubules
Sac-like with fluid
Flexible, inextensible helical filament
Double membrane
2
What are the function(s) of actin filaments?
Transport materials
Detoxify harmful substances
Provide mechanical support, allow movement
Store genetic material
3
What role does surface area-to-volume ratio play in cell size?
Surface area has no effect on function
Increases cell size as ratio increases
Decreases cell's surface area
Ensures fast resource/waste exchange
4
What is the primary function of flagella?
Helps the cell move
Cellular respiration
Protein synthesis
Transport of materials within the cell
5
What is the structure of ribosomes?
Particles composed of protein and RNA molecules
Flattened sacs with pores
Filament, hook, basal body
Double membrane
6
What are the function(s) of Golgi apparatus?
Produce enzymes
Transport materials throughout the cell
Store genetic material
Synthesize ATP
7
What is a cell organelle?
A specialized structure within a cell that performs distinct processes
The outer membrane surrounding a cell
A single-cell organism
A type of cell found only in plants
8
Which function is associated with the plasma membrane?
Synthesizes ATP
Synthesizes lipids
Transports proteins
Regulates cell interaction and protection
9
Why are eukaryotic cells considered more complex than prokaryotic cells?
Larger with more organelles
They are harder to see
They reproduce faster
They live longer
10
How do temperature changes affect enzyme activity?
Molecules move faster at higher temperatures
Higher temps stabilize the enzyme
Lower temperatures increase enzyme speed
All temperatures slow enzyme activity
11
What is the structure of large central vacuole?
Sac-like cell
Particles composed of protein and RNA molecules
Hollow tubes
Double membrane
12
What is the structure of peroxisomes?
Hollow tubes
Particles composed of protein and RNA molecules
Membranous sacs
Series of connected flattened sacs
13
What are enzymes, and what role do they play in biological reactions?
Catalysts that break down cells
Proteins that speed up chemical reactions in cells
Sugars that serve as a cell's energy
Lipids that store energy
14
What is the structure of nucleus?
Nuclear envelope, pores, chromosomes, nucleolus
Series of connected flattened sacs
Single membrane
Double membrane
15
Why are cell organelles essential for cells?
They act as a boundary for the cell
They store nutrients
They aid in reproduction
They perform tasks crucial for cellular health
16
What is the structure of plasmodesmata?
Membranous sacs
Series of connected flattened sacs
Double membrane
A narrow thread of cytoplasm
17
What are the function(s) of nuclear envelope?
Synthesize proteins
Detoxify harmful substances
Enclose the nucleus
Store genetic material
18
What are the function(s) of plasma membrane?
Produce ATP
Regulation, cell recognition
Detoxify harmful substances
Store genetic material
19
What is the structure of cell wall?
Membranous sacs
Hollow tubes
Double membrane
No membrane, carbohydrate fibers
20
Which structure serves as the control center of the cell?
Ribosomes
Mitochondria
Nucleus
Lysosomes
21
What is the structure of lysosomes?
Flattened membranous sacs
Double membrane
Cytoplasm thread
Membrane sac of digestive enzymes
22
How do cell size and shape relate to their functions?
Size only matters for mobility
Cells are uniform in size across functions
Size/shape has no effect on function
Size/shape determines function
23
Compare and contrast prokaryotic and eukaryotic cells.
Both have 80S ribosomes
Prokaryotes have mitochondria
Prokaryotes lack nucleus; eukaryotes have nucleus
Both have membrane-bound organelles
24
What is the function(s) of flagella?
Site of photosynthesis
Digests fatty acids
Helps the prokaryotic cell move
Protein synthesis
25
What is the optimal temperature range for most enzymes?
122°F
98.6°F
104°F
45°F
26
Which type of cell typically contains chloroplasts, cell walls, and a large central vacuole?
Fungal cells
Bacterial cells
Plant cells
Animal cells
27
What is the structure of cilia?
Small, slender, hair-like structures
Double membrane
Series of flattened sacs
Particles composed of protein and RNA molecules
28
What is the role of nuclear pores?
Allow RNA and proteins to pass in and out of nucleus
Synthesizes DNA
Package lipids
Organize cell division
29
Why do extreme conditions denature enzymes?
Because enzymes are sugars
Because enzymes are fats
Because enzymes are nucleic acids
Because enzymes are proteins
30
How do reaction graphs depict energy changes in reactions?
Up/down with activation energy “hump”
Graph with dots for each energy level
Bar graph showing height of reactants
With a line showing time
31
What is the main role of cilia?
Protect cell from toxins
Locomotion
Synthesizes ATP
Acts as cell boundary
32
What is the primary difference between plant and animal cells?
Animal cells have chloroplasts
Plant cells have cell walls; animal cells do not
Plant cells lack organelles
Plant cells have lysosomes; animal cells do not
33
What would happen to enzyme activity if the enzyme is denatured?
Enzyme would take in more substrate
Enzyme function would increase gradually
Enzyme would not function
Enzyme would speed up
34
How does the fluid mosaic model describe the plasma membrane?
Cell membrane is a solid barrier
Lipids and proteins move laterally in a fluid structure
Made of carbohydrate fibers
Proteins are embedded in the nucleus
35
What distinguishes eukaryotic cells that can be multicellular?
They have membrane-bound organelles
They lack flagella
They are smaller
They have only one membrane
36
What are the function(s) of large central vacuole?
Detoxify harmful substances
Synthesize proteins
Produce ATP
Store H2O
37
How do eukaryotic cells achieve compartmentalization?
Through internal membranes and organelles
Through a single membrane
By using cytoplasm
Only with DNA
38
What structure is unique to plant cells?
Lysosomes
Centrioles
Ribosomes
Chloroplasts
39
What are the function(s) of Smooth Endoplasmic Reticulum?
Detoxify harmful substances
Store genetic material
Synthesis and storage of lipids
Produce ATP
40
What is the largest cell in the human body?
Blood cell
Egg cell
Neuron
Muscle cell
41
What are the function(s) of centrioles?
Organize the mitotic spindle
Detoxify harmful substances
Store genetic material
Synthesize proteins
42
What is the structure of nucleolus?
Fibrous proteins
Dense spherical structure
Hollow tubes
Double membrane
43
What organisms are classified as prokaryotes and eukaryotes?
Plants are prokaryotic
Bacteria are prokaryotes; humans are eukaryotes
Both can be multicellular
Viruses are classified as prokaryotes
44
How can graphical representations help in understanding enzyme concentration and reaction rates?
Show enzymes’ effect on activation energy
Show substrate breakdown speed
Show enzyme effect on color changes
Show temperature fluctuation effects
45
What is the structure of Rough Endoplasmic Reticulum (Rough ER)?
Smooth tubular structure
Connected sacs with ribosomes
Filament-like structure
Flattened discs
46
How does increasing enzyme concentration lower activation energy?
Breaks substrate into two
Reduces energy needed for reactants to meet
Converts substrate to reactants
Adds heat to make reactants move faster
47
What are the function(s) of nucleus?
Detoxify harmful substances
Store genetic material
Control center of the cell
Produce ATP
48
What are the function(s) of plasmodesmata?
Channel for transport in/out of plant cells
Detoxify harmful substances
Provides mechanical support
Store genetic material
49
What are the function(s) of nuclear pores?
Store genetic material
Allow RNA/proteins to pass in/out of nucleus
Detoxify harmful substances
Produce ATP
50
What are the three parts of the cytoskeleton?
Actin filaments, centrioles, ribosomes
Microtubules, microfilaments, intermediate filaments
Microvilli, chloroplasts, vesicles
Cilia, flagella, mitochondria
51
How does the structure of epithelial cells relate to their function?
Allows fast nutrient transfer
Creates muscle tissue
Stores DNA
Protects organs
52
What is the structure of flagella?
Hollow tubes
Series of connected flattened sacs
Filament, hook, basal body
Particles composed of protein and RNA molecules
53
What is the structure of nucleolus?
Double-layered membrane
Jelly-like material
Series of flattened sacs
Dense sphere in the nucleus
54
Which structure describes the Golgi apparatus?
Double membrane with cristae
Flattened membrane-enclosed sacs and vesicles
A filament-like hook
Series of channels
55
Which best describes the function of lysosomes?
Package and transport lipids
Synthesize proteins
Digestive enzymes within a membrane sac
Store fatty acids
56
What are the function(s) of cytoplasm?
Aids in cell movement
Fills space in cell
Synthesizes proteins
Digests harmful substances
57
What is the structure of nuclear pores?
Double membrane
Series of connected flattened sacs
Openings through nuclear envelope
Hollow tubes
58
Which cell structure is involved in photosynthesis and only found in plant cells?
Nucleus
Mitochondria
Chloroplasts
Lysosomes
59
What are the function(s) of mitochondria?
Detoxify harmful substances
Synthesize proteins
Convert sugars into usable energy (ATP)
Store genetic material
60
What is the function of ribosomes in both cell types?
To replicate RNA
To produce proteins
To store energy
To produce DNA
61
What is the primary purpose of the large central vacuole?
Stores water
Synthesis of proteins
Detoxification
Assists in cell division
62
What is the structure of mitochondria?
Dense spherical structure
Flexible helical filament
Double membrane
Jelly-like material
63
What is the structure of ribosomes?
Filament, hook, basal body
Particles of protein and RNA molecules
Double membrane
Flattened sacs with pores
64
What are the function(s) of peroxisomes?
Produce ATP
Transport materials
Store genetic material
Break down fatty acids
65
What is the structure of nuclear envelope?
Double membrane with channel proteins
Single membrane
Membranous sacs
Hollow tubes
66
Provide an example of an enzyme and its specific function.
Lactase breaks down proteins
Cellulase stores energy
Hemoglobin carries oxygen in blood
Amylase in saliva breaks starches into sugars
67
What is the structure of chloroplasts?
Membranous sacs
Hollow tubes
Double membrane bound, contains thylakoid discs
Double membrane
68
What is the function of centrioles?
Aid in cellular movement
Transport proteins
Organize the mitotic spindle for cell division
Synthesize proteins
69
Explain the difference between endothermic and exothermic reactions.
Both absorb energy
Both release energy
Exothermic absorbs, endothermic releases
Endothermic absorbs, exothermic releases heat
70
What is the significance of an enzyme's active site?
Releases the product
Protects the enzyme
Binds the substrate
Denatures the substrate
71
What is cell biology, and why is it important to study?
Study of cell respiration
Study of cells’ structure and function
Study of genetics and evolution
Study of photosynthesis
72
What is the structure of flagella?
Filament, hook, basal body
Phospholipid bilayer
Membranous sacs
Hollow center
73
What is activation energy, and how do enzymes affect it?
Minimum energy needed for a reaction; enzymes lower it
Energy needed for reactions to stop
Enzymes increase activation energy
It’s the energy enzymes store
74
How do changes in pH levels influence enzyme function?
pH has no effect on enzymes
Lower pH always increases activity
Enzyme activity increases with any pH
Enzyme activity decreases outside the optimal pH
75
Which process occurs in the nucleolus?
Ribosome production
ATP synthesis
Photosynthesis
Detoxification
76
What factors can disrupt the lock and key model of enzyme-substrate interaction?
Salinity does not affect this interaction
Temperature alone
Changes in pH, temperature, and salinity
Only pH fluctuations
77
Where does photosynthesis take place?
Lysosomes
Mitochondria
Chloroplasts
Ribosomes
78
What is the structure of Rough Endoplasmic Reticulum?
Membranous sacs
Hollow tubes
Double membrane
Series of connected flattened sacs, studded with ribosomes
79
What is the structure of Golgi secretory vesicles?
Filament-like structure
Flattened membrane-enclosed sacs
Series of connected flattened sacs
Double membrane
80
What is the structure of nucleoplasm?
Series of connected flattened sacs
Hollow tubes
Double membrane
Granular, jelly-like material
81
What are the function(s) of intermediate filaments?
Transport materials
Provide structure and support
Anchor nucleus and organelles
Detoxify harmful substances
82
What are the function(s) of Rough Endoplasmic Reticulum?
Synthesis/processing of proteins
Produce ATP
Store genetic material
Detoxify harmful substances
83
What is the structure of intermediate filaments?
Hollow tubes
Double membrane
Fibrous proteins supercoiled into thicker cables
Membranous sacs
84
What are the function(s) of cilia?
Synthesize proteins
Locomotion
Store genetic material
Detoxify harmful substances
85
Which type of organisms are always unicellular?
Prokaryotes
Plants
Animals
Eukaryotes
86
What is the enzyme-substrate complex, and how is it formed?
Complex that releases heat
A molecule that stores energy
Molecule formed when substrate binds to enzyme
Protein denatured by substrate
87
What are the three parts of a cytoskeleton?
Series of connected flattened sacs
Microtubules, microfilaments, intermediate filaments
Membranous sacs
Double membrane
88
What is the main function of the cell wall?
Packages proteins
Digests harmful substances
Protection and shape maintenance
Synthesizes ATP
89
Which molecules pass easily through the plasma membrane?
Proteins and nucleic acids
Gases and small polar molecules
Sugars and proteins
DNA and RNA
90
Explain the lock and key model of enzyme-substrate interaction.
Enzyme wraps around substrate
Enzyme locks away the substrate
Substrate fits into enzyme like a key in a lock
Substrate competes with enzyme
91
What are the function(s) of ribosomes?
Energy production
Cellular respiration
Lipid storage
Protein synthesis
92
Explain the significance of membrane-bound organelles in eukaryotic cells.
Function as the cell’s skeleton
Allow cellular processes to occur separately
Only help with movement
Only protect DNA
93
What are the function(s) of Golgi secretory vesicles?
Modify, package proteins and lipids
Detoxify harmful substances
Synthesize proteins
Convert sugars to ATP
94
What are the function(s) of nuclear lamina?
Detoxify harmful substances
DNA replication, RNA transcription
Produce ATP
Store genetic material
95
Describe the effect of salinity on enzyme activity.
Salt has no effect on enzymes
Higher salt increases enzyme activity
Too much salt can slow or stop enzyme activity
Lower salt increases enzyme speed
96
What is the structure of actin filaments?
Flexible, inextensible helical filament
Membranous sacs
Hollow tubes
Fibrous proteins supercoiled into thicker cables
97
What is the structure of nuclear lamina?
Intermediate filaments made of lamins
Double membrane
Series of connected flattened sacs
Hollow tubes
98
How does locomotion in prokaryotes differ from eukaryotes?
Eukaryotic cells use cilia instead
Prokaryotic flagella spin; eukaryotic flagella wave
Eukaryotic flagella spin faster
Prokaryotic cells move slowly
99
What type of macromolecule are enzymes made of?
Carbohydrates
Nucleic acids
Proteins
Lipids
100
What is the main function of the cytoplasm?
Controls what enters and exits the cell
Synthesizes proteins
Fills space within the cell
Aids in cell movement
101
What is the structure of Smooth Endoplasmic Reticulum?
Series of connected flattened sacs
Hollow tubes
Membranous sacs
Meshwork of fine disklike tubular membrane vesicles
102
What is the meaning of the term "selectively permeable"?
Blocks all materials
Lets everything in
Only allows water to pass
Allows certain substances in and out
103
What is the structure of centrioles?
Membranous sacs
Series of flattened sacs
Nine triplets of microtubules with a hollow center
Double membrane
104
What are plasmodesmata?
Cytoplasm thread connecting plant cells
Hair-like structures on cell surface
Microfilament structure
Protective outer layer
105
Which of the following best describes the function of ribosomes?
Lipid storage
Cell movement
Energy production
Protein synthesis
106
What are the function(s) of chromatin?
Package long DNA into compact structures
Store genetic material
Detoxify harmful substances
Produce ATP
107
In what types of environments can bacteria survive?
Warm, moist, pH-neutral areas
Salty environments only
Dry and oxygen-poor environments
High temperatures only
108
What is the structure of chromatin?
Fibrous proteins
DNA, protein, RNA
Hollow tubes
Membranous sacs
109
What are the function(s) of chloroplasts?
Produce ATP
Site of photosynthesis
Store genetic material
Detoxify harmful substances
110
What are the function(s) of microtubules?
Store genetic material
Produce ATP
Shape/support cell, separate chromosomes
Synthesize proteins
111
How do enzymes speed up chemical reactions?
By raising the activation energy
By lowering the activation energy
By adding more reactants
By releasing heat
112
What is the main function of chloroplasts?
Site of photosynthesis
Provides cell shape
Aids in cell movement
Transports proteins
113
What are the function(s) of cell wall?
Transport materials
Detoxify harmful substances
Store genetic material
Protect cell and maintain shape
114
Which process is the mitochondria responsible for?
Transporting materials
Detoxifying harmful substances
Converting sugars to ATP
Producing digestive enzymes
115
How does a neuron’s structure relate to its function?
Makes it strong enough to protect organs
Allows fast energy production
Makes it easy to absorb nutrients
Allows for transmitting signals to other cells
116
What is the primary function of microtubules?
Shape and support of cell
Synthesis of proteins
Control center for cell
Breaking down fatty acids
117
What is the role of peroxisomes in a cell?
Detoxify harmful substances and break down fatty acids
Produce ATP for the cell
Store genetic material
Synthesize proteins
118
What is the structure of mitochondria?
Double membrane
Single membrane
Hollow tubes
Filament-like structure
119
How is DNA stored differently in prokaryotic vs. eukaryotic cells?
Prokaryotes: cytoplasm; eukaryotes: nucleus
Prokaryotes store DNA in nucleus
Eukaryotes store DNA in ribosomes
Both store DNA in cytoplasm
120
What is the structure of Golgi apparatus?
Double membrane
Series of connected flattened sacs
Flattened membranous sacs
Membranous sacs
121
What are the function(s) of nucleoplasm?
Produce ATP
Detoxify harmful substances
Help in synthesis and functioning of DNA/RNA
Store genetic material
122
What is the structure of microtubules?
Series of connected flattened sacs
Membranous sacs
Hollow tubes
Fibrous proteins supercoiled into thicker cables
123
What happens to the reaction rate when enzyme concentration increases?
Reaction time triples
Rate stays constant
Activation energy decreases
Enzymes increase in size
124
What is the function of the Golgi apparatus?
Transports, modifies, and packages proteins and lipids
Synthesizes lipids
Acts as cell's control center
Maintains cellular shape
125
What are the function(s) of nucleolus?
Detoxify harmful substances
Synthesize proteins
Makes ribosomes
Produce ATP
126
What are the main fields that benefit from understanding cell biology?
Psychology and economics
Genetics, molecular biology, and immunology
History and sociology
Chemistry and physics
127
What is the key difference regarding the nucleus in prokaryotes vs. eukaryotes?
Prokaryotes have a large nucleus
Both store DNA in nucleus
Eukaryotes have a nucleus, prokaryotes don’t
Prokaryotes store DNA in nucleus
128
What is the chemical formula for cellular respiration?
C6H12O6+O2→H2O
O2+H2O→ATP+CO2
6CO2+12H2O→C6H12O6+6O2
H2O+O2→C6H12O6
129
What is the structure of plasma membrane?
Phospholipid bilayer
Membranous sacs
Hollow tubes
Double membrane

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