AnswersBiology - SC3209 CRUnit Test

Unit Test — Unit test Answers

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Which element is found in both DNA and protein?

A
sulfur
B
sodium
C
nitrogen
D
chlorine
2
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Which will increase the rate of a chemical reaction?

A
adding a catalyst
B
decreasing the pressure
C
decreasing the temperature
D
removing a catalyst
3

Hemophilia is a disease that causes uncontrollable bleeding. If a father has it, all of his daughters will be carriers of the disease. Which macromolecule is involved in how hemophilia is passed from parents to their children?

A
carbohydrate
B
lipid
C
nucleic acid
D
protein
4

Which statement about enzymes is true?

A
An enzyme functions to decrease the rate of a chemical reaction.
B
Enzymes are proteins that function as catalysts in nonliving things.
C
Each enzyme can catalyze many different biochemical reactions.
D
Enzymes and substrates fit together like a lock and key.
5

A scientist is conducting an investigation that involves water, silver, carbon dioxide, and oxygen gas. Which group of statements best describe all of the materials he is using in the investigation?

A
They are each compounds. Each of the compounds is made of atoms. All of the atoms are made of matter.
B
They are each made of matter. Some are compounds and some are elements. They all contain atoms.
C
They are all elements. Some contain molecules of the same type of atom. Some contain different types of atoms.
D
They are each made of matter. Some are compounds made of one type of element. Some are pure atoms.
6

A patient has diabetes, a disease that causes high blood sugar levels. Which macromolecule will a dietician monitor most closely in a patient that has the disease?

A
carbohydrates
B
lipids
C
nucleic acids
D
proteins
7

Responding to the environment is a characteristic of life best shown by which example?

A
a human shivers on a cold day
B
a horse trots in a field
C
a dog swims in a pond
D
a cat licks its paws
8

Organisms contain different levels of organization within their bodies. Arachnoidiscus ehrenbergi, pictured below, is a single-celled organism that is part of the group of algae known as diatoms. Photo by Gordon T. Taylor, courtesy of the NOAAWhich level of organization is seen in both Arachnoidiscus ehrenbergi and the human stomach?

Question illustration
A
cell
B
tissue
C
organ
D
organ system
9

A dietician asks a patient about the food that the patient eats and makes the table below to summarize the results.MacromoleculeSuggested percentage of dietActual percentage of dietCarbohydrates45–65%70%Lipids20–35%5%Proteins10–35%25%Based on the table, what advice do you think that the dietician will give the patient?

A
The patient should increase the amount of lean meats (proteins) and decrease the amount of oils in his or her diet.
B
The patient should decrease the amount of lean meats (proteins) and increase the amount of oils in his or her diet.
C
The patient should decrease the amount of rice and pasta and increase the amount of oils in his or her diet.
D
The patient should decrease the amount of rice and pasta and increase the amount of lean meats (proteins) in his or her diet.
10

A scientist is examining the function of macromolecules in a cell. She notices that movement of large molecules into and out of the cell is disrupted when she damages one specific type of macromolecule. Which macromolecule has she most likely damaged?

A
a carbohydrate
B
a steroid
C
a nucleic acid
D
a protein
11

The graph below compares the rates of reaction of a burning candle and an exploding firework.What can you conclude from the graph?

Question illustration
A
The reaction that causes a firework to explode requires less energy to start, and occurs more rapidly than the reaction that causes a candle to burn.
B
The reaction that causes a firework to explode requires less energy to start, and occurs less rapidly than the reaction that causes a candle to burn.
C
The reaction that causes a firework to explode requires more energy to start, and occurs less rapidly than the reaction that causes a candle to burn.
D
The reaction that causes a firework to explode requires more energy to start, and occurs more rapidly than the reaction that causes a candle to burn.
12

Organisms may contain up to five levels of organization within their bodies. Which level of organization is best represented by the liver?

A
tissue
B
organ
C
organism
D
organ system
13

Which type of molecule that can be found in living things lacks carbon atoms?

A
protein
B
carbohydrate
C
fat
D
water
14

Which statement best describes the relationship between activation energy and rate of reaction?

A
Increasing the activation energy can increase the rate of a reaction.
B
Reducing the activation energy can increase the rate of a reaction.
C
Increasing the reaction energy does not alter the rate of reaction.
D
Reducing the activation energy can decrease the rate of a reaction.
15

The heart is an example of which level of organization within an organism?

A
cell
B
organ
C
tissue
D
organ system
16

A scientist is examining the role of an element found in fats and carbohydrates of living things. This element makes up 65% of human body mass. Which statement describes the element he is studying?

A
He is studying oxygen, which can also be found in proteins.
B
He is studying oxygen, which is the most abundant element in the atmosphere.
C
He is studying nitrogen, which can also be found in proteins.
D
He is studying nitrogen, which is the most abundant element in the atmosphere.
17

Which statement best describes how a catalyst can speed up a chemical reaction?

A
The catalyst decreases the activation energy needed.
B
The catalyst increases the concentration of products.
C
The catalyst binds to enzymes to release substrates.
D
The catalyst increases the concentration of reactants.
18

Photosynthesis is an example of

A
an exothermic reaction.
B
an endothermic reaction.
C
a reaction that gives off heat.
D
a reaction that emits energy.
19

Which macromolecule forms a double layer as the primary structure of cell membranes?

A
fats
B
oils
C
phospholipids
D
steroids
20

Living organisms, such as trees and cows, share certain characteristics of life. Which statement describes a difference in one of the characteristics of life shared by trees and cows?

A
One of the organisms produces asexually, the other does not.
B
One of the organisms responds to the environment, the other does not.
C
One of the organisms gets energy directly from the sun, the other does not.
D
One of the organisms grows and changes, but the other does not.

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