AnswersFL-2000310-Biology 1Unit Test

Unit Test — Unit test Answers

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1
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Why do phospholipids form a bilayer in water?

A
The phosphate portions repel each other.
B
The hydrophilic and hydrophobic parts attract each other.
C
The phosphate portions attract water, and the lipid portions repel water.
D
The lipid portions attract water, and the phosphate portions repel water.
2
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Which carbohydrate can be used by the body as an immediate source of energy?

A
glucose
B
cellulose
C
chitin
D
glycogen
3

Why have improvements in microscopes over time resulted in revisions in the cell theory?

A
They have revealed new information about cell structure and processes.
B
They have made microscopes easier to use.
C
They have allowed scientists to share pictures of the cells being studied.
D
They have made it possible to confirm what scientists already suspected.
4

What would most likely happen if a person increased the amount of saturated fat in his or her diet?

A
The person's risk of cardiovascular disease would increase.
B
The person's risk of cardiovascular disease would decrease.
C
The person's bad cholesterol would decrease.
D
The person’s good cholesterol would increase.
5

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.
6

Which type of protein will fight disease?

A
insulin
B
antibodies
C
ligaments
D
genes
7

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.
8

A recent encyclopedia entry about dogs cites multiple research papers done by scientists at veterinary schools. According to the article, Labrador retrievers come in two specific breeds: English and American. The English breed is described as stocky and heavy, while the American breed is described as tall and lanky. The article describes current scientific research as showing that males of both breeds usually weigh about 29-41 kg (65-90 lb), and females weigh 25-32 kg (55-70 lb). Coat colors for both breeds come in solid black, yellow, or chocolate. All labs have strong tails and webbed feet, which help them swim. Devon would like to use this information to determine if his new dog is an English or American Labrador retriever. Which best describes the reliability of the information?

A
It is not reliable because only scientists can use scientific information for reference.
B
It is not reliable because it doesn’t talk about how to test and only gives data about the breeds.
C
It is reliable because the article is based on multiple studies done by scientists at multiple veterinary schools.
D
It is reliable because it gives information about both types of Labradors in addition to information about other types of dogs.
9

All theories are hypotheses, but not all hypotheses are theories. Francis wants to know if a specific hypothesis he is researching is a theory. Which describes how Francis would know the hypothesis is a theory?

A
He could restate the hypothesis as a fact and no longer an explanation.
B
He could determine whether the hypothesis is based on repeated experiments.
C
He could perform the experiment and adjust data to match the desired results.
D
He could design and perform a new controlled experiment to test the hypothesis.
10

After school, Kai feels hungry and tired. He finds some sugar cookies in the cabinet and finishes the whole package. Which statements best describe the role of glucagon and insulin in this scenario?

A
Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. Insulin was secreted after he ate the cookies because his blood glucose was high.
B
Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. Glucagon was secreted after he ate the cookies because his blood glucose was high.
C
Glucagon was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, insulin from the cookies increased his blood sugar levels.
D
Insulin was secreted by his pancreas before he ate the cookies because his blood glucose was low. After he ate, glucagon from the cookies increased his blood sugar levels.
11

In double-blind studies neither the test subject or the researcher knows who was given the drug and who was given the control. Why are these studies effective for testing a drug that may elevate mood and relieve feelings of depression?

A
Since there are two symptoms that are affected, a double-blind study is required.
B
Double-blind studies are ways to ensure that only the researcher can figure out who is getting the effective drug.
C
Double-blind studies are the most economical way to gather results from testing on humans.
D
The patients and researchers are not given this information so they cannot be influenced in reporting the effectiveness.
12

Which is released during the formation of a peptide bond?

A
a five-carbon sugar
B
an amino group
C
an amino acid
D
a water molecule
13

Take a look at the statement below:Fish meal is better than artificial fertilizers.How could this statement be revised to make it a hypothesis?

A
Fish meal is safer than artificial fertilizers, but it does not make plants grow.
B
Fish meal is a better fertilizer than artificial fertilizer because fish meal is natural.
C
Plants that are fertilized with fish meal will grow taller than plants that receive artificial fertilizer.
D
Plants that receive artificial fertilizer will be better than plants that receive fish meal.
14

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
15

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.
16

What would most likely happen if an error occurred when RNA was receiving coding information?

A
Proteins would be formed incorrectly.
B
DNA would form incorrectly.
C
RNA could not form a correct blueprint.
D
The incorrect amino acid would form.
17

Hybrid seeds are deliberately crossbred for particular traits, such as growth pattern or disease resistance. They have been hand-pollinated and are patented, often sterile, and genetically identical within food types. These plants are usually grown in a monocultural environment and are cultivated for mass production and sale. They must be sturdy to withstand mechanical picking and cross-country shipping. They do not compare to the quality and taste of heirloom plants, but they do produce large, healthy fruit that appeals to most shoppers. Unlike heirloom seeds, if one saves a hybrid seed, one will not get the same plant again. Which statement can be removed and not affect the excerpt’s reliability?

A
Hybrid seeds are deliberately crossbred for particular traits, such as growth pattern or disease resistance.
B
They do not compare to the quality and taste of heirloom plants, but they do produce large, healthy fruit that appeals to most shoppers.
C
Unlike heirloom seeds, if one saves a hybrid seed, one will not get the same plant again.
D
They have been hand-pollinated and are patented, often sterile, and genetically identical within food types.
18

What is the general term for any carbohydrate monomer?

A
glucose
B
polysaccharide
C
monosaccharide
D
fructose
19

What would most likely happen to a person who is not getting enough essential amino acids in his or her diet?

A
The body would synthesize the amino acids.
B
Muscle growth and repair would be limited.
C
Stored protein would break down.
D
The formation of proteins would increase.
20

Which statement best explains why the development of a new area of science can lead to changes in a theory?

A
A new area of science attracts new scientists who study old theories for flaws.
B
A new area of science promotes experimentation from a different point of view.
C
A new area of science allows old theories to be reworded using new terminology.
D
A new area of science encourages scientists to replace old theories with modern ones.

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