Practice Test Answers

22 verified answers
1
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In algae and plants, photosynthesis happens in the

A
mitochondria.
B
vacuoles.
C
chromosomes.
D
chloroplasts.
2
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What type of lipid is estrogen?

A
triglyceride
B
wax
C
phospholipid
D
steroid
3

A scientist is working with methane open paren CH sub 4 close paren and butane open paren cap c sub 4 cap h sub 10 close paren Which statement best compares these chemicals?

A
They are two different types of molecules that each contain the same number of atoms.
B
They are compounds made of the same two elements, but each contain different numbers of atoms.
C
They are matter made of the same two compounds, but each contain different types of elements.
D
They are two different types of atoms that are each made up of a different number of elements.
4

Which term identifies a light-absorbing pigment?

A
ferredoxin
B
thylakoid
C
chlorophyll
D
photosystem
5

How does adenosine triphosphate (ATP) become adenosine diphosphate (ADP)?

A
ATP releases energy as a phosphate bond is formed.
B
ATP stores energy as a phosphate bond is formed.
C
ATP stores energy as a phosphate bond is broken.
D
ATP releases energy as a phosphate bond is broken.
6

How does ATP supply energy for cellular activities?

A
by breaking off a phosphate group from its structure
B
by releasing the sugar molecule from its structure
C
by adding a phosphate group to its structure
D
by attaching itself to a glucose molecule
7

Which statement describes thylakoids?

A
Photosystems I and II function here.
B
Only photosystem II functions here.
C
Water molecules are formed here.
D
Glucose is formed here.
8

What scientific knowledge about macromolecules is a direct result of Gerardus Johnannes Mulder’s 1838 discovery?

A
All proteins contain carbon, hydrogen, oxygen, and nitrogen.
B
The helical structure of DNA is essential for protein production.
C
All carbohydrates contain carbon, hydrogen, and oxygen.
D
Nucleic acids are polymers with nucleotide monomers.
9

Which reaction is exothermic?

A
a reaction that requires an activation energy
B
a reaction that absorbs energy from the environment
C
a reaction that does not involve a change in energy
D
a reaction that releases energy into the environment
10

Why is the Calvin cycle considered a dark reaction?

A
It occurs only at night.
B
It turns the plant dark green.
C
It can proceed in the dark.
D
It requires an absence of light.
11

Which component is affected when a catalyst is added to a chemical reaction?

A
the activation energy
B
the concentration of reactants
C
the amount of product
D
the amount of substrate
14

Which term is correctly paired with its role in the body?

A
insulin – a sugar that regulates blood glycogen levels
B
glycogen – a hormone found in blood that regulates blood glucose levels
C
ADP – a molecule that releases energy when it forms ATP
D
glucose – a sugar found in blood that can be broken down to produce ATP
15

What is carbon fixation, and how does it relate to photosynthesis?

A
It is the production of CO sub 2 during regeneration, and it forms RuBP.
B
It is the conversion of CO sub 2 into organic compounds, and it forms 3-PGA.
C
It is the absorption of CO 2 from the air, and it occurs during the light-dependent reactions.
D
It is the reduction of CO sub 2 , and it occurs during the Calvin cycle.
16

Which of these can combine in a cell to convert a lower-energy molecule into a higher-energy molecule?

A
ADP plus cap p plus energy
B
ADP plus cap p
C
ATP plus cap p
D
ATP plus cap p plus energy
17

There are more hydrogen atoms in living organisms than any other atom, but oxygen is more abundant in terms of mass. Why is this statement true?

A
Hydrogen atoms have a lower mass than oxygen atoms.
B
Hydrogen is a gas, but oxygen is a solid.
C
Hydrogen is present as single atoms and oxygen is bonded in compounds.
D
Hydrogen atoms make up more of water's mass than oxygen atoms.
18

What prohibits lipids from being a readily available energy source?

A
Fat must be broken down into fatty acids before being converted to glucose.
B
The conversion of fat to glucose is controlled by insulin.
C
Lipids are structural components, so they are a last-resort energy source.
D
Lipids are only used to create enzymes, hormones, and antibodies.
19

Which carbohydrate is shown?

A
galactose
B
fructose
C
starch
D
sucrose
20

What type of lipid is shown?

A
phospholipid
B
triglyceride
C
saturated
D
unsaturated

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