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Genetic Code — Unit test Answers

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Which best illustrates the result of the process of meiosis?

A
A pea plant has the same flower color as its parent plants.
B
A daughter looks different from both her mother and her father.
C
A cheetah cub has very similar fur to its mother.
D
A Labrador puppy looks exactly like its father.
5

Which best describes a codon?

A
a cell structure that gives the master instructions for an organism
B
a segment of DNA that is the basis of heredity in organisms
C
the sequence of three bases that codes for a specific amino acid
D
the basic unit of structure and function of all living things
6

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
7

Which flow chart correctly organizes the structures of heredity, from least to most complex?

A
codon ® gene ® DNA ® chromosome
B
gene ® chromosome ® codon ® DNA
C
DNA ® codon ® chromosome ® gene
D
chromosome ® DNA ® gene ® codon
8

Which equation represents fertilization?

A
haploid + diploid = diploid
B
diploid + haploid = haploid
C
haploid + haploid = diploid
D
diploid + diploid = diploid
10

A strand of DNA contains the bases adenine, cytosine, cytosine, and guanine, in that order. Which would be the order of the bases on the opposite strand of DNA?

A
cytosine, adenine, adenine, and thymine
B
cytosine, thymine, thymine, and adenine
C
thymine, guanine, guanine, and cytosine
D
thymine, adenine, adenine, and cytosine
11

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.
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

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