Unit Test — Unit test Answers

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Maria is concerned because she has been exposed to a small amount of radiation during an X-ray. What is her doctor most likely to tell her?

A
Radiations from X-rays is not a mutagen.
B
Mutagens have no effect on the body unless you have inherited them.
C
Small amounts of a mutagen often do not have an effect on health.
D
Severe mutations are usually caused by small amounts of a mutagen.
3

Which best matches a type of genetic material with its description?

A
Nucleotides form a helical structure that is called a gene.
B
Genes combine to form structures called nucleotides.
C
Chromosomes create genes.
D
DNA is located in the nucleus.
4

Which best summarizes the process of protein synthesis?

A
RNA instructs DNA to make proteins.
B
DNA unzips, resulting in the formation of two protein molecules.
C
RNA moves the DNA code to the ribosomes for protein synthesis.
D
DNA makes proteins in the nucleus.
5

Which describes something that occurs during translation?

A
A DNA template is used to create an mRNA strand.
B
A tRNA template is used to create a DNA strand.
C
A tRNA template is used to create an mRNA strand.
D
An mRNA template is used to create an amino acid chain.
8

Which of the following correctly organizes these genetic terms in order from smallest to largest?

A
chromosome, gene, nucleotide, DNA molecule
B
nucleotide, gene, DNA molecule, chromosome
C
DNA molecule, nucleotide, gene, chromosome
D
DNA molecule, nucleotide, chromosome, gene
9

What was Friedrich Miescher's contribution to the discovery of the genetic code?

A
He created the first photograph of the structure of DNA.
B
He discovered how the DNA bases pair together.
C
He created the first accurate model of DNA's structure.
D
He extracted and observed DNA from white blood cells.
10

How many genes make up the human genome?

A
four: adenine, thymine, guanine, and cytosine
B
23 pairs of genes
C
20,000–25,000 genes
D
3 billion genes
11

What must occur for protein translation to begin?

A
A water molecule must be added to the protein chain.
B
A peptide bond must form between subunits of mRNA.
C
The amino acid Cys must be picked up by tRNA.
D
The codon AUG must be identified.
12

James is working with the lac operon of Escherichia coli (E. coli). He places the bacteria on a plate of growth media. Based on the current understanding of this operon, which hypothesis would be useful for James to test?

Question illustration
A
Addition of allolactose (inducer) to the bacterial growth media should increase the speed at which the bacteria metabolize the sugar lactose.
B
Removal of the RNA polymerase molecule should increase the amount of bacterial growth on the plate.
C
Decreasing the amount of allolactose (inducer) in the bacterial growth media should increase the rate of bacterial growth.
D
Increasing the rate at which RNA polymerase acts will inhibit bacterial growth.
13

A forensic scientist is trying to find out the number of adenine bases in the DNA sample that he obtained from a crime scene.What can he assume about the number of adenine?

A
The number of adenine bases will be equal to the number of guanine bases.
B
The number of adenine bases will be equal to the total of all the other bases.
C
The number of adenine bases will be equal to the number of thymine bases.
D
The number of adenine bases will be half of the number of cytosine bases.
14

Which represents a strand of RNA bases?

A
CAAGGTCTC
B
AGGTTCACA
C
CAAGGUCUC
D
TGGAACTCA
15

What can a person do to limit exposure to X-rays?

A
wear sunblock
B
avoid cigarette smoke
C
wear a protective lead vest
D
avoid chemicals
16

Which is a frameshift mutation?

A
substitution
B
nonsense
C
silent
D
deletion
17

Why can uracil be used as a “clue” to identify RNA in a strand?

A
Because uracil is found in both DNA and RNA.
B
Because uracil indicates a damaged DNA strand.
C
Because uracil is always paired with thymine.
D
Because uracil is unique to RNA.
18

Which base is found only in RNA?

A
ribose
B
thymine
C
uracil
D
deoxyribose
19

Which of the following could be a nucleotide of RNA?

A
deoxyribose + phosphate group + thymine
B
deoxyribose + phosphate group + uracil
C
ribose + phosphate group + thymine
D
ribose + phosphate group + uracil

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