Question 1

What is an operon?

  A  

the binding site for a repressor protein


  B  

any group of genes responsible for the metabolism of lactose in prokaryotes or eukaryotes

  C  

a cluster of genes under the control of a promoter

  D  

a regulatory gene

0

/

1

Question 2

Below are three processes that occur within living organisms.

1 - apoptosis

2 - mitosis

3 - meiosis

Which of these processes is/are important in determining the body plan of an organism?

  A  

1 and 2

  B  

1 and 3

  C  

2 and 3

  D  

1, 2, and 3

0

/

1

Question 3

Hox genes contain a homeobox sequence of 180 base pairs.

Two species have a homeobox sequence of 180 base pairs where 1.7% of the base pairs are different.

What is the number of amino acids coded for that would be different in the two species?

  A  

minimum 0 and maximum 1


  B  

minimum 0 and maximum 3

  C  

minimum 1 and maximum 2

  D  

minimum 1 and maximum 3

0

/

1

Question 4

When a gene mutation occurs, which of the following may be altered, resulting in the production of a non-functional protein?

1 - amino acid sequence

2 - DNA nucleotide sequence

3 - mRNA nucleotide sequence

  A  

1, 2, and 3

  B  

1 and 2 only

  C  

2 and 3 only

  D  

2 only

0

/

1

Question 5

How do transcription factors affect the transcription of a gene when they bind to its promoter region?

  A  

they always initiate transcription

  B  

they always prevent transcription

  C  

they have no effect on transcription

  D  

they can either enhance or inhibit transcription

0

/

1

Question 6

To what do transcription factors in eukaryotes bind?

  A  

operons

  B  

specific DNA sequences near genes

  C  

mRNA

  D  

ribosomes

0

/

1

Question 7

What is the function of the product of the regulatory gene in the lac operon?

  A  

it breaks down lactose

  B  

it speeds up the transcription process

  C  

it suppresses the transcription of structural genes

  D  

it transports lactose into the cell

0

/

1

Question 8

Which molecule affects the binding of the lac repressor to the operator site?

  A  

glucose

  B  

galactose

  C  

sucrose

  D  

lactose

0

/

1

Question 9

What is the role of the regulatory gene in the lac operon?

  A  

it codes for β-galactosidase

  B  

it codes for the lac repressor protein

  C  

it allows lactose to enter the cell

  D  

it breaks down lactose into glucose

0

/

1

Question 10

The enzyme β-galactosidase is classified as what type of enzyme?

  A  

inducible enzyme

  B  

repressible enzyme

  C  

constitutive enzyme

  D  

permanent enzyme

0

/

1

Question 11

What happens when lactose is present in the medium where a bacterium capable of digesting lactose is growing?

  A  

lactose is ignored by the bacterium

  B  

lactose prevents transcription of the lac operon

  C  

lactose is broken down outside the bacterial cell

  D  

lactose induces transcription of the lac operon

0

/

1