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Biology EOC RC2

Total questions: 20

Worksheet time: 20mins

Name
Class
Date
1.
What is one advantage of sexual reproduction?
a)
offspring are identical to parents
b)
offspring are resistant to viruses
c)
offspring are born live, rather thna from eggs
d)
offspring inherit a wider variety of genetic information
2.
Replicate the following strand of DNA: 
AATCATGGA
a)
AATCATGGA
b)
TTAGTACCT
c)
UUAGUACCU
d)
GGATAUCUA
3.
Colorblindness is a recessive, X chromosome sex-link disorder. Cross the parents to figure out which percentage of their offspring will be colorblind.
a)
25%
b)
0%
c)
75%
d)
50%
4.
What fraction of offspring from the cross AaBB x Aabb will be heterozygous for both traits?
a)
1/16
b)
4/16
c)
8/16
d)
3/16
5.

What is the purpose of Strand A?

a)

to act as a template for the synthesis of messenger RNA

b)

to carry the code from the DNA molecule in the nucleus to the ribosome

c)

picks up and transfers specific amino acids to the ribosome

d)

picks up and transfers nucleic acids to the nucleus

6.

What mRNA sequence will best match the section of DNA shown?

a)

C-T-A-G-G-C

b)

C-U-A-G-G-A

c)

A-G-C-U-U-C

d)

T-C-G-A-A-G

7.

What is the main purpose of the structure labeled D in the diagram above?

a)

Bring the amino acid to the ribosome

b)

Assemble the amino acids into a protein

c)

Copy the DNA strand

d)

Edit the mRNA strand

8.

The diagram above represents a biochemical process that occurs in a cell. The purpose of this process is to synthesize -

a)

deoxyribonucleic acid

b)

protein

c)

messenger RNA

d)

carbohydrate

9.

Use the mRNA codon chart to identify Amino Acid 1 in the given picture.

a)

Isoleucine

b)

Tyrosine

c)

Methionine

d)

Serine

10.
In many humans, exposing the skin to sunlight over prolonged periods of time results in the production of more pigment by the skin cells (tanning). This change in skin color provides evidence that -
a)
the inheritance of skin color is an acquired characteristic.
b)
albinism is a recessive characteristic.
c)
ultraviolet light can cause mutations.
d)
the environment can influence gene action.
11.

A mutation has occurred in a mRNA fragment that was originally CUU. Using the codon chart given above, which of the following mutated mRNA fragments would result in an amino acid sequence different from that produced by the CUU fragment?

a)

CUC

b)

CUA

c)

CUG

d)

CAU

12.

Which of the following chromosomal mutations is represented in the diagram above?

a)

translocation

b)

duplication

c)

deletion

d)

inversion

13.
An insertion of a DNA base into a gene can affect an organism by—
a)
causing future gametes to have additional chromosomes.
b)
changing the sequence of amino acids in a protein.
c)
causing chromosome fragments to form long chains.
d)
changing the structure of ribose sugar in nucleic acids.
14.
Nitrogenous bases are located on both strands of the DNA double helix. What is the significance of the nitrogenous bases?
a)
The number of adenines and cytosines determines the type of RNA that will be produced.
b)
The order of nitrogenous bases determines the order of amino acids in the proteins synthesized.
c)
The amount of thymine and guanine in the DNA molecules determines the length of the genes.
d)
The type of hydrogen bonding between the nitrogenous bases determines which amino acid will be added to the peptide chain.
15.
Which DNA strand is complementary to the top one shown in the picture?
a)
A
b)
B
c)
C
d)
D
16.
A model of a biological process is shown. What is the purpose of this process?
a)
To replicate the DNA of an organism before cell division
b)
To assemble nucleotides in an mRNA chain along a DNA template
c)
To synthesize amino acids used to unzip strands of DNA and copy the genetic code
d)
To translate the genetic code into a specific sequence of amino acids
17.
Four different types of cells are shown in picture. Which characteristic is shared by all four cells?
a)
A mechanism for transforming sunlight into energy
b)
Self-locomotion
c)
Membrane-bound organelles that transport substances
d)
Genetic material composed of DNA
18.
Which diagram demonstrates how crossing-over contributes to genetic variety during meiosis?
a)
A
b)
B
c)
C
d)
D
19.
Name this structure
a)
double helix
b)
nucelotide
c)
twisted ladder
d)
hydrogen bond
20.
How many chromosomes do humans have?
a)
46
b)
21
c)
10

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