AP Biology Protein Synthesis and Gene Expression

A certain gene codes for a polypeptide that is 120 amino acids long. Approximately how many nucleotides long is the mRNA that codes for this polypeptide likely to be?

• 360
• 480
• 40
• 30

Tags

NGSS.HS-LS1-1

Transcribe the following DNA sequence:
TAT GGC ACT 

• TAT GGC ACT
• ATA CCG TGA
• AUA GGC UGA
• UAU GGC ACU

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 the different amino acids.
• A gene from an organism can theoretically be expressed by any other organism.
• All organisms have experienced convergent evolution.
• DNA was the first genetic material.

Tags

NGSS.HS-LS4-1

NGSS.HS-LS4-2

 A frameshift mutation could result from 

• a base insertion only.
• a base deletion only. 
• a base substitution only. 
• either an insertion or a deletion of a base.

Tags

NGSS.HS-LS3-2

The anticodon of a particular tRNA molecule is 

• complementary to the corresponding mRNA codon.
• complementary to the corresponding triplet in rRNA.
• the part of tRNA that bonds with a specific amino acid.
• catalytic, making the tRNA a ribozyme.

In eukaryotic cells, transcription cannot begin until 

• the two DNA strands have completely separated and exposed the promoter.
• several transcription factors have bound to the promoter.
• the 5' caps are removed from the mRNA.
• the DNA introns are removed from the template.

Original: ATC CAT
Mutation: ATC GCAT
What mutation occurred?

• deletion
• insertion
• silent
• transverse

Tags

NGSS.HS-LS3-2

What type of mutation has occurred here? 
T-G-A-C-C-A
T-G-A-G-C-A

• Substitution
• Deletion
• Insertion
• Frameshift 

Tags

NGSS.HS-LS3-2

what does a promoter do?

• it allows a gene to be transcribed by giving RNA Pol 2 a docking site

• it creates a DNA segment using DNA pol

• it is another word for ribosomes

• it promotes transcription

The "on/off" switch for an operon is called the

• promoter
• repressor
• operator
• gene