AP Biology Unit 6 Biotechnology

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

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.

This can inhibit transcription by blocking the binding of positively acting transcription factors to the DNA:

• enhancer

• promoter

• repressor

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

• ligase

• a restriction enzyme

The DNA profiles in the figure represent four different individuals. Which of the following statements is consistent with the results?

• B is the child of A and C.

• C is the child of A and B.

Tags

NGSS.HS-LS3-1

Which of the following are characteristics of plasmids? ( more than 1 answer applies)

• Circular DNA strand

• RNA strands

• Contain resistance genes

• Found in eukaryotes

• Found in prokaryotes

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