Genetics Test #3

Which process is illustrated in the diagram in question 1?

What would happen to chromosome ends in the absence of telomerase?

The ends of chromosomes would get longer

The ends of chromosomes would get shorter

The ends of chromosomes would be recombined

The ends of chromosomes would unwind

Which is a mechanism that allows a single gene to encode more than one polypeptide?

In eukaryotes, the 5' cap on an mRNA is important for all the processes listed below except for the __________ of an mRNA molecule.

Transcription

Intron removal

Stability

Initiation of translation

Which statement about the genetic code is not true?

Some codons can specify more than one amino acid

The genetic code is the same or very similar in all species examined so far

The genetic code includes start and stop signals

The genetic code is read in groups of three adjacent nucleotides

Most amino acids are specified by more than one codon

An example of a gene product encoded by a regulatory gene is?

Beta-galactosidase enzyme

Allolactose

Repressor protein

Operator

The next step in the translation of this mRNA will be the formation of a peptide bond between who two amino acids?

2 and 3

2 and 4

1 and 3

1 and 2

After the peptide bond forms, what will happen?

TRNA A will be carrying the polypeptide and it will shift to the P site

TRNA A will be carrying the polypeptide and will shift to the A site

TRNA B will be carrying the polypeptide and it will shift to the P site

TRNA B will be carrying to polypeptide and it will shift to the A site

An operon is controlled by a repressor. When the repressor binds to a small molecule, it binds to DNA near the operon. The operon is constitutively expressed if a mutation prevents the repressor from binding to the small molecule. Control of this is...

Negative inducible

Negative repressible

Positive inducible

Positive repressible

Genetics Test #3

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