WorksheetsMANY QUESTIONS (DNA/RNA/MUTATIONS)
Total questions: 12
Worksheet time: 6mins
Name
Class
Date
1.
A human skin cell contains 46 chromosomes. A frog sperm cell contains 12 chromosomes. Which pair of numbers shows the chromosome number of a normal gamete from each of these species?
a)
human 46; frog 12
b)
human 46; frog 24
c)
human 23; frog 12
d)
human 23; frog 24
2.
Which diagram represents a pair of homologous chromosomes?
a)
1
b)
2
c)
3
d)
4
3.
The genes for red hair and freckles are usually inherited together because these genes are
a)
homologous
b)
sorted independently
c)
linked
d)
hybrid traits
4.
Which statement best describes the process of crossing-over?
a)
It takes place between homologous chromosomes and results in new gene combinations.
b)
It takes place between nonhomologous chromosomes and results in an increased gene mutation rate.
c)
It takes place between homologous chromosomes and results in an increased gene mutation rate.
d)
It takes place between nonhomologous chromosomes and results in new gene combinations.
5.
A strand of DNA in a skin cell contains the bases:
A-T-G-C-C-A-T-C-G-G-T-A
After the cell is exposed to ultraviolet light, the strand contains the bases:
A-T-G-G-C-C-A-T-C-G-G-T-A
Which statement describes the result of this exposure?
A-T-G-C-C-A-T-C-G-G-T-A
After the cell is exposed to ultraviolet light, the strand contains the bases:
A-T-G-G-C-C-A-T-C-G-G-T-A
Which statement describes the result of this exposure?
a)
A new base has been inserted.
b)
A base has been deleted.
c)
One base has been substituted for another.
d)
There have been no changes in the bases.HIDE ANSWER
6.
A new chemical was discovered and introduced into a culture containing one species of bacteria. Within a day, most of the bacteria were dead, but a few remained alive. Which statement best explains why some of the bacteria survived?
a)
They had a genetic variation that gave them resistance to the chemical.
b)
They were exposed to the chemical long enough to develop a resistance to it.
c)
They mutated and became a different species after exposure to the chemical.
d)
They absorbed the chemical and broke it down in their digestive systems.
7.
Base your answer on the diagram of the chromosomes from a human cell and on your knowledge of biology.
The individual from whom these chromosomes were taken is a
The individual from whom these chromosomes were taken is a
a)
male
b)
female
c)
hermaphrodite
d)
polyploid
8.
Base your answer on your knowledge of biology and on the charts which show human chromosomes arranged in pairs.
The chromosomes numbered 1 through 22 are known as
The chromosomes numbered 1 through 22 are known as
a)
ribosomes
b)
lysosomes
c)
centrosomes
d)
autosomes
9.
The diagram represents an incomplete section of a DNA molecule. The boxes represent unidentified bases.
When the boxes are filled in, what will the total number of bases represented by the letter A (both inside and outside the boxes) be?
When the boxes are filled in, what will the total number of bases represented by the letter A (both inside and outside the boxes) be?
a)
1
b)
2
c)
3
d)
4
10.
A DNA nucleotide may contain
a)
deoxyribose, cytosine, and a lipid
b)
deoxyribose, thymine, and a phosphate group
c)
ribose, uracil, and a polypeptide
d)
ribose, adenine, and thymine
11.
Which event takes place first during DNA replication?
a)
A single-stranded RNA molecule is formed.
b)
Transfer RNA links to an amino acid.
c)
Free nucleotides are bonded together in the correct sequence.
d)
The DNA molecule "unzips" along weak hydrogen bonds.
12.
What is the function of transfer RNA molecules in the synthesis of proteins?
a)
They provide nucleotides for messenger RNA production.
b)
They carry genetic instructions to the nucleus.
c)
They pick up and transport amino acids to the ribosomes.
d)
They are chemically changed into amino acids.
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