AnswersBiology A The Living Earth AUnit Test

Unit Test — Cumulative exam Answers

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1
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Which is the final electron acceptor in the electron transport chain of cellular respiration?

A
NADH
B
FADH2
C
oxygen
D
carbon dioxide
2
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A relationship in which one organism benefits while the other is neither harmed nor helped is called

A
predation.
B
parasitism.
C
commensalism.
D
mutualism.
3

Which type of deposition creates sandbars?

A
glacial
B
river
C
wave
D
wind
4

Which type of macromolecule is made up of subunits that are called amino acids?

A
carbohydrate
B
lipid
C
nucleic acid
D
protein
5

Pandas eat bamboo for energy. What are pandas classified as?

A
producers
B
consumers
C
decomposers
D
autotrophs
6

Read the following information from a Material Safety Data Sheet (MSDS) about the chemical hydrochloric acid (HCl).“Skin Contact: In case of contact, immediately flush skin with plenty of water for at least 15 minutes while removing contaminated clothing and shoes. Wash clothing before reuse. Thoroughly clean shoes before reuse. Get medical attention immediately.”Based on this information, which is the most important thing to do right away if a student spills HCl on his shirt?

A
Remove the shirt, and rinse the skin with water.
B
Remove the shirt, and find a sink to rinse it in.
C
Get help from a classmate immediately.
D
Call 911 to get medical attention immediately.
7

What do all cellular activities in living organisms use as a source of energy?

A
ATP
B
lactic acid
C
pyruvic acid
D
carbon dioxide
8

Consider the generalized cladogram of fish.Osteichthyes is a group of fish that have the derived characteristics of jaws and true bones. Which letter corresponds to where Osteichthyes belongs on the cladogram?

Question illustration
A
A
B
B
C
C
D
D
9

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
10

Photo 51 is a picture of the structure of DNA that was used to create a model of DNA. Who created the photo?

A
James Watson and Francis Crick
B
Erwin Chargaff
C
Rosalind Franklin
D
Friedrich Miescher
11

What could explain the curve in this population growth graph?

Question illustration
A
an unlimited food supply
B
a natural disaster
C
a population crash
D
a reduction in predators
12

It can be seen on a cladogram that modern birds and reptiles share a common ancestor. Select the piece of evidence that best supports this idea.

A
Reptiles are also related to mammals.
B
Birds have evolved into many groups.
C
Feathers are a derived characteristic that first evolved in reptiles.
D
Birds have the derived characteristic of being warm blooded, like mammals.
13

The image shows sedimentary rock layers.

Question illustration
1
1
2
2
3
3
4
4
14

James wants to create a self-sustaining ecosystem, or vivarium. Which method would most likely result in an ecosystem that is viable for the longest amount of time with no additional care?

A
Put a few plants, water, sand, and a heat lamp inside a clear glass aquarium and seal the top. Place it in a sunny location.
B
Put water, fertilizer, soil, plants and insects in an open, clear glass aquarium. Place it in an area that has some sunlight and some shade.
C
Put rocks, water, and many plants in an open, dark-colored plastic tub. Place it in an area with direct sunlight.
D
Put soil, water, many plants, and a few insects in a sealed, clear plastic aquarium. Place it in an area with indirect sunlight.
15

Barnacles and whales have a commensalistic relationship in which barnacles benefit. What would most likely happen to the whale population if the barnacle population decreased?

A
become extinct
B
decrease
C
increase
D
stay the same
16

Which animals use the specialized roles of diver and barrier while participating in cooperative hunting?

A
ants
B
zebra
C
bottlenose dolphins
D
wildebeests
17

Which statement describes the law of superposition?

A
Sedimentary rocks were originally in horizontal layers.
B
In horizontal rock layers, each layer is younger than the one below it.
C
Rock layers must be in existence before something can happen to them.
D
Rocks that are not in horizontal layers were shifted by some geologic event.
18

A dietician examines the diet of a patient who is complaining that he is unable to build muscle mass. The patient eats mainly fresh fruits, vegetables, pasta, bread, and some fats and oils. Which type of supplement will the dietician most likely recommend?

A
citric acid
B
fatty acids
C
nucleic acids
D
amino acids
19

Which best defines a diploid cell during meiosis?

A
a cell that has double the number of chromosomes as the parent cell
B
a cell that has half the number of chromosomes as the parent cell
C
a cell that has double the number of chromosomes as the daughter cell
D
a cell that has half the number of chromosomes as the daughter cell
20

If the producer population in an ecosystem decreased, what would most likely happen to the size of the herbivore population?

A
It would decrease.
B
It would double.
C
It would stay the same.
D
It would triple.

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