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Exam 1 prep
Exam 1 prep
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1
Why does ice float
Because it’s science
Because the molecules hold it together in a lattice
Because it’s less dense
Because it’s dense
2
Proteins are the most functionally diverse class of biological macromolecules
True
False
3
Electrons have a negative charge and no mass
True
False
4
hydrophobic means “water loving”
False
True
5
An element are atoms with different atomic #s
False
True
6
Which of the following is NOT a characteristic of prokaryotic organisms
They are always unicellular
They have many internal membranes
They often form colonies
They are the smallest and simplest organisms
7
I’m order for life to exist we require___ pH
Neutral
4,5,6
14
6,7,8
8
A _______ is a unicellular prokaryote
Fish
Pine tree
Bacterium
Protist
9
Animals, plants, fungi, and protists are different ______ of life.
Species
Kingdoms
Phyla
Domains
10
Which organelle is NOT defined by a membrane
Mitochondrion
Chloroplast
Nucleus
Ribosome
11
A theory is general and more reliable than a hypothesis
True
False
12
All eukaryotic organisms are multicellular
False
True
13
Most common elements in our bodies are…
Calcium, zinc, sulfur, hydrogen
Oxygen, carbon, nitrogen, hydrogen
Carbon, nitrogen, oxygen, argon
Carbon, carbon dioxide, nitrogen, hydrogen
14
Nonpolar covalent bonds occur due to unequal sharing of electrons
True
False
15
The completeness of a shell is determined by the number and arrangement of Electrons
False
True
16
Hydrophobic literally means
Water fearing
Hydrogen fearing
Water loving
Made of hydrogen
17
Cohesion-H-bonding is
Holds non polar molecules together
Holds polar molecules together
Holds liquid molecules apart, water + water
Holds molecules in liquid water together
18
An electron is negatively charged
True
False
19
There are ___ kinds of nucleic acids and they differ primarily in their ____
2, nitrogenous bases
2, structure
3, sugar
2, sugar
20
In water, electrons are more attracted to the H+ molecules than the O
False
True
21
A compound are two or more elements in a fixed ratio
False
True
22
Atoms are mostly empty space
False
True
23
The _____ group is the variable of an amino acid
Amino group
Carboxyl group
R group
24
Water is most dense at
212F
100C
0C
4C
25
Nucleic acid polymers, via dehydration require energy
False
True
26
Neutrons have a charge and mass
True
False
27
“Eu” in Eukaryotes means
Before
Nucleus
True
28
“Bio” in “Biosphere” means or relates to?
Life
Biology
Atmosphere, rock, water
Earth
29
The Russian chemist who created the period table
Dmitri Mendeleev
Dmitri Shostakovich
Nikolai Semyomov
Charles Darwin
30
Hydrolysis requires energy
True
False
31
_____ are the major lipids of plasma membranes
Phospholipids
Triglycerides
Steroids
Fatty acids
32
All cells are microscopic
False
True
33
Nucleotide has how many structures?
6
2
4
3
34
Polar covalent bonds are between O, N, H
False
True
35
O, N, and C can readily form double bonds
False
True
36
In solid water (ice), water molecules are _____ than in liquid water
Farther apart
Close together
There is no difference in the distance between water molecules
37
ALL DNA has the same structure, it’s the sequence of bases that matter
False
True
38
Hydrogen bonding between water molecules holds up to ___ bonds.
1
4
2
3
39
A solution (liquid) with a pH of 9 is _______
Neutral
Acidic
Basic
40
Adhesion is H bonding that…
Is non polar, water+ water
Polar, water + water substance
Polar, water + other substance
Non polar, water + other substance
41
The most hydrophobic compartment would be abundant in….
Sucrose
Glucose
Fructose
Lipids
42
Neutrons have a charge
False
True
43
Covalent bonds occur when atoms share one or more pairs of electrons
False
True
44
pH is a measure of _____ in a solution (liquid)
H+ ions
Water molecules
OH-ions
45
The ___ is the smallest unit of matter, not divisible by ordinary chemical means
Atom
Molecule
Cell
Subatomic particle
46
What could be produced by hydrolysis of a large carbohydrate molecule
Diamoniacid
Dinucleotide
Difattyacid
Disaccharide
47
If carbon has an atomic number of 6 and an atomic mass of 12, how many neutrons does it have
12
6
18
5
48
Water is
Both an acid and a base
Neither an avid nor a base
An acid
A base
49
A population is more complex than a community
True
False
50
An atoms charge is determined by the number of
Protons
Electrons
Neutrons
Protons + electrons
51
The vast majority of scientists have personal agendas and biases that undermine their ability to be honest and objective
True
False
52
You misplace your car keys and are trying to find them. As per the scientific method, “my keys are in the pocket. Relate
Question
Hypothesis
Experiment
Test
53
eukaryotic cells have cell walls
False
True
54
Which of these is NOT a defining feature of plant cells?
Chloroplasts
Mitochondria
Central vacuole
Cellulose-based cell wall
55
The nucleus in eukaryotic cells contain a nucleolus
False
True
56
Atoms with ____ outer shells interact with other atoms
I don’t know
Electrons
Complete
Incomplete
57
The completeness of a shell is determined by protons
False
True
58
Phospholipids have a hydrophilic head and 2 hydrophobic tails
True
False
59
I’m order to sustain life, cells must generally have a relatively large surface area to volume ratio
True
False
60
The nucleus of a eukaryotic cell contain All of the cell’s DNA
True
False
61
You have discovered a new cell and see that it has a Golgi apparatus. It could be a member of
There is not enough information to decide
Archaea
Eukaryotic
Bacteria
62
Protons have a positive charge and mass
True
False
63
Protons are negatively charged
True
False
64
Phospholipids are both hydrophobic and _____
Liquid
Charged
Solid
Waxy
65
Nucleotide structure includes
5 carbon sugar, hydrogen group, nitrogenous base
3 carbon sugar, hydrogen group, nitrogenous base
5 carbon sugar, phosphate group, nitrogenous base
66
Carbon cannot bond to itself
True
False
67
Enzymes are almost always proteins
False
True
68
Second and third shell holds 4 orbitals, up to 8 e-
True
False
69
Water is most dense at 4C
True
False
70
Light microscopes have better resolution than electron microscopes
True
False
71
Oppositely charged atoms with polar covalent bonds are attracted to each other
True
False
72
When proteins are heated, they usually denature. If a molecule of DNA were heated, what part would break apart first
The nitrogen base pairs would separate in the interior of the molecule
The nucleotides along each side would break apart
The sugar phosphate backbone would separate from the nitrogen bases
73
Hydrophilic means “water loving”
False
True
74
The first shell has..
The lowest energy, 1 orbital
The most energy
The lowest energy
1 e-
75
We call hydrogen ions protons
True
False
76
Hydrogen bonds are ____ than covalent bonds
Long lasting
Stronger
Weaker
77
Which is an example of a polysaccharide
Gylocogen
Starch
Glucose
78
Ribosomes are found in both prokaryotes and eukaryotes
True
False
79
Every component of an ecosystem is a living thing?
False
True
80
Pro in prokaryotic cells means
Life
Nucleus
After
Before
81
The nucleus has protons and electrons
False
True
82
Which of these statements is NOT part of Cell Theory?
All organisms are composed of one or more cells
Cells are the basic unit of organization
All cells arise from preexisting cells
All living cells must have a cell wall
