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Middle School Science
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Life & Earth Science questions for Twelve practice
Flashcards
47 cards
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Practice quiz
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Questions
47
Answers
1
Pathogens are:
used for treatment.
what transmits diseases.
what causes disease.
what cures diseases.
2
Which of the following is NOT a characteristic of all primates?
Opposable thumbs
Flexible shoulders
Binocular vision
A large brain
3
How does petrified wood form?
Sedimentary rock forms over a log.
Igneous rock covers a log and heats it.
Water seeps through a log, replacing its cells with minerals
A log falls into water that freezes.
4
A "twisted ladder" or "double helix" of 2 strands of molecules with the chemical code for cells
chromosome
organelles
nucleus
DNA
5
This nutrient makes up most of our body weight and is our most essential nutrient:
Protein
Cells
Blood
Water
6
In radiometric dating, ______ changes to lead as it ages.
uranium
radium
carbon
platinum
7
This algae is best at absorbing sunlight deep into the ocean.
Green
Blue-green
Brown
Red
8
Movements of individuals into or out of a population provides a source of _____ to a population
punctuated equilibrium
mutations
variation
camouflage
9
Finding mosasaur fossils gave evidence that Texas was once covered by _____.
mountains
a sea
desert
forests
10
The species Homo sapiens means what?
"wise human"
"tool-using man"
"handy man"
"Southern ape"
11
All of the following EXCEPT ______ provide evidence for evolution.
camouflage
vestigial structures
embryology
homologous structures
12
The periodic table is divided into columns & rows. Horizontal rows are known as what?
Stat boxes
Periods
Steps
Rows
13
Emergent diseases are:
old from the past
eradicated
non-infectious
new
14
Which element is used to help make glass stronger?
Nitrogen
Boron
Sodium
Lithium
15
How many bones are in the human body?
251
137
206
148
16
DNA studies show that the closest relative of a bear is the _____.
dog
wolverine
gorilla
sloth
17
When a cell divides, a copy of DNA is created & given to daughter cells. This process is called
Triplets
Original dosage
Molecules
Replication
18
Variations are important in populations because they can lead to _______.
less evolution
more fossils
better environments
new species
19
Newton's Second Law says Force = mass x acceleration. (F=ma) How else could this be written?
a=F/m
Fm=a
m=F/a
m=Fa
20
Homo habilis was given its name because _____.
it was found in East Africa
its jaw was humanlike
stone tools were found near it
its brain cavity was very small
21
Approximately what is the age of the Earth?
9.5 billion years
1.1 billion years
570 million years
4.6 billion years
22
Who explained that species evolve by keeping traits their parents developed during their life?
Darwin
Lamarck
Laughlin
Slaughter
23
The process of using energy to move materials through a cell's membrane is called:
fermentation
passive transport
osmosis
active transport
24
Conjugation is a type of:
amoeba
reproduction
paramecium
algae
25
Malaria is transmitted by:
mosquitos
airborne particles
water droplets
animals
26
In the chemical equation H
2
+ O = H
2
O, what is the product?
H2
O
H2O
HO
27
What is the sugar molecule that is a major energy source for most cells called?
amino acid
protein
carbohydrate
lipid
28
Amoebas are able to engulf its prey by:
flagella
cilia
food vacuoles
pseudopedia
29
In which time span did dinosaurs live?
Cenozoic era
Mesozoic era
Precambrian time
Paleozoic era
30
What virus attacks the immune system's helper T-cells?
Influenza
Polio
Malaria
HIV
31
Which statement best describes the theory of uniformitarianism?
Earth continues to change as it always has.
Earth is changing, but not as quickly as it used to.
Earth is no longer changing.
Earth is changing, but faster than it used to.
32
Which of the following statements is NOT true of compounds?
Elements combine to form compounds
Chemical bonds make compounds fall apart
Compounds have different properties from parent elements
Chemical bonds hold compounds together
33
Which of the following is NOT a characteristic of hominids?
Eating vegetables
Eating meat
Walking upright
Being most active at night
34
Nearly identical oxygen-carrying hemoglobin, a protein in ____ cells, is found in many primates
brain
kidney
lung
blood
35
Diatoms are known for what type of wall structure?
Amoeba-like
Shell-like
Proto-like
Glass-like
36
Organisms that live in a pond (such as frogs & plants) are referred to as:
polycellular & unicellular
multicellular & polycellular
living & semi-living
unicellular & multicellular
37
Bacteria is considered a prokaryote because:
its DNA is in the nucleus.
cytoplasm is contained within a nuclear wall.
it is microscopic.
it does not have a nucleus.
38
What is the name of the organelle in a plant cell that uses energy from sunlight to make sugar?
cytoplasm
chlorophyll
cell membrane
chloroplast
39
What is the last part of the cell cycle, during which the cytoplasm divides called?
mitosis
regeneration
interphase
cytokinesis
40
All the following are true concerning heterotrophs EXCEPT:
Invade host cells
Can be considered decomposers
They produce their own food
They cannot make their own food
41
The theory of ______ results in organisms with traits best suited to their environment?
acquired characteristics
embryology
survival of the smartest
natural selection
42
Water molds are in which classification?
Dinoflagellate
Virus
Protists
Algae
43
Most fossils are found in ______.
Sedimentary rock
Wood
Bones
Caves
44
What happens when two oceanic plates meet?
One plate slides past the other.
The colder, denser plate sinks.
Both plates sink into the asthenosphere.
Both plates fold the rock between them.
45
Protists are mainly:
aquatic
terrestrial
symbiotic
mutual
46
Lichens have this type of association with fungus:
mutual
diatomic
symbiotic
parasitic
47
Antibiotics do not effect which of the following:
Diseases
Virus
Illnesses
Bacterias
