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Chromosomes — Unit test Answers

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What will happen if RNA polymerase fails to attach to the promoter?

A
Translation will begin early.
B
Transcription will not begin.
C
RNA polymerase will unwind DNA strands.
D
An mRNA strand will be made before translation begins.
4

What does DNA provide the code for?

A
nitrogenous base pairing
B
protein synthesis
C
deoxyribose formation
D
nucleotide synthesis
6

Which base is found only in DNA?

A
adenine
B
guanine
C
cytosine
D
thymine
7

Which best describes a gene?

A
the short arm of a chromosome
B
tightly coiled strands of DNA
C
the center of a chromosome
D
a segment of chromosomal DNA
8

Which of the following difference between DNA and RNA allows them to perform their unique functions?

A
DNA contains ribose, while RNA contains deoxyribose.
B
DNA is single-stranded, whereas RNA is double-stranded.
C
DNA contains thymine, while RNA contains uracil.
D
RNA is found only in the nucleus, while DNA is found only in the cytoplasm.
10

Which accurately describes the relationship between cancer risk and exposure to mutagens?

A
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutation decreases as well.
B
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations increases as well.
C
Cancer risk increases when a person is exposed to mutagens because the risk of DNA mutations decreases considerably.
D
Cancer risk decreases when a person is exposed to mutagens because the risk of DNA mutations increases considerably.
11

What purpose does the peptide bond serve in protein synthesis?

A
It connects amino acids.
B
It adds a water molecule to the amino acid chain.
C
It releases the protein from the tRNA.
D
It makes a strand of mRNA.
12

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
14

Which statements describe the characteristics of an individual protein? Select two options. It is specific to one biochemical reaction.It increases the activation energy needed for a reaction.It can catalyze many different reactions.It increases the rate of a biochemical reaction.It slows down the rate of a biochemical reaction.

A
It is specific to one biochemical reaction.
B
It increases the activation energy needed for a reaction.
C
It can catalyze many different reactions.
D
It increases the rate of a biochemical reaction.
E
It slows down the rate of a biochemical reaction.
15

A scientist observes a pair of separate chromosomes that have genes for the same trait arranged in the same order. However, some of the alleles for the genes are different. What is the scientist most likely observing?

A
homologous chromosomes with heterozygous alleles
B
homologous chromosomes with homozygous alleles
C
heterozygous chromosomes with heterozygous alleles
D
heterozygous chromosomes with homozygous alleles

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Chromosomes — Unit test Answers — Biology A