AP Biology

The tryptophan operon is a repressible operon that is

• turned off whenever tryptophan is added to the growth medium

• turned on only when glucose is present in the growth medium.

Tags

NGSS.HS-LS1-3

When this is taken up by the cell, it binds to the repressor so that the repressor no longer binds to the operator:

• inducer

• repressor

Transcription of the structural genes in an inducible operon

• occurs continuously in the cell.

• starts when the pathwayʹs substrate is present.

Altering patterns of gene expression in prokaryotes would most likely serve the organismʹs survival in which of the following ways?

• allowing the organism to adjust to changes in environmental conditions

• organizing gene expression so that genes are expressed in a given order

• allowing environmental changes to alter the prokaryoteʹs genome

Tags

NGSS.HS-LS4-5

Muscle cells and nerve cells in one species of animal owe their differences in structure to

• having different genes.

• having different genes expressed.

Tags

NGSS.HS-LS3-2

If you were to observe the activity of methylated DNA, you would expect it to

• be unwinding in preparation for protein synthesis.

• have turned off or slowed down the process of transcription.

Tags

NGSS.HS-LS3-2

Which enzyme was used to produce the molecule in the Figure?

• ligase

• a restriction enzyme

Which of the following describe the structure of mature RNA? (more than 1 answer applies)

• Contains Uracil

• Contains introns and exons

• Has a poly-A tail and 5' cap

• Single stranded

• Circular strand

Describe the orientation of the phospholipids in the membrane.

• Phospholipids orient in bilayer with hydrophilic heads on exterior

• Phospholipids orient in monolayer with hydrophilic head on extracellular

• Phospholipids orient in bilayer with hydrophobic tails on exterior

• Phospholipids orient in monolayer with hydrophobic tails on extracellular

How is DNA/RNA synthesis directionally oriented?

• new nucleotides are added to 5' phosphate

• new nucleotides are added to 3' phosphate

• new nucleotides are added to 5' hydroxyl

• new nucleotides are added to 3' hydroxyl