Genetics and Molecular Biology Worksheet

Eukaryotic transcription differs from prokaryotic in that

• eukaryotes have only one RNA polymerase.

• eukaryotes have three RNA polymerases.

• prokaryotes have three RNA polymerases.

• Both a and c are correct.

The genetic code is essentially the same for all organisms. From this, one can logically assume which of the following?

• The same codons in different organisms translate into different amino acids.

• A gene from an organism can theoretically be expressed by any other organism.

• DNA was the first genetic material.

• Different organisms have different types of amino acids.

The figure above shows a simple metabolic pathway. According to Beadle and Tatum's hypothesis, how many genes are necessary for this pathway?

• 1

• 2

• 3

• It cannot be determined from the pathway.

Refer to the metabolic pathway illustrated above. If A, B, and C are all required for growth, a strain that is mutant for the gene-encoding enzyme A would be able to grow on a medium supplemented with.

• nutrient A only

• nutrient B only

• nutrient C only

• nutrients A and C nutrient

Refer to the metabolic pathway illustrated above. If A, B, and C are all required for growth, a strain mutant for the gene-encoding enzyme B would be able to grow on a medium supplemented with.

• nutrient A only

• nutrient B only

• nutrient C only

• nutrients A and C

A possible sequence of nucleotides in the template strand of DNA that would code for the polypeptide sequence phe-leu-ile-val would be _____

• AAA-AAT-ATA-ACA

• TTG-CTA-CAG-TAG

• AAA-GAA-TAA-CAA

• AUG-CTG-CAG-TAT

What would the anticodon be for a tRNA that transports phenylalanine to a ribosome?

• AAA

• UUU

• TTT

• CCC

Which of the following contradicts the one-gene, one-enzyme hypothesis?

• Alkaptonuria results when individuals lack a single enzyme involved in the catalysis of homogentisic acid.

• A single antibody gene can code for different related proteins, depending on the splicing that takes place post-transcriptionally.

• A mutation in a single gene can result in a defective protein.

• Sickle-cell anemia results in defective hemoglobin.

In the process of transcription, ____.

• mRNA attaches to ribosomes

• DNA is replicated

• proteins are synthesized

• RNA is synthesized

Codons are part of the molecular structure of ____.

• tRNA

• mRNA

• rRNA

• a protein