Unit 6: Gene Expression & Regulation
Biology · Unit 6 · Paper 2

Gene Expression & Regulation unit test

A test on this unit alone, marked as a percentage and a letter grade — for the test your class is actually sitting, rather than for May. Answer everything, then submit once: seeing the answer to question 3 before attempting question 4 makes the final percentage meaningless.

Paper 1Paper 2Paper 3
Each paper is built from this unit’s 40 terms and is the same for everyone, so a teacher can assign “Unit 6, Paper 2” and every student sits the identical test. Multiple choice is marked objectively; the written sections you mark yourself against the model answer and rubric.
Suggested time 31 min 28 points0/17 attempted
1

Ribosome A, P and E sites

2

Introns and exons

3

Universality of the genetic code

4

Gel electrophoresis

5

Leading vs lagging strand

6

Mismatch repair and proofreading

7

Enhancers and silencers

8

PCR

9

Transcription factors

10

Start and stop codons

11

CRISPR

12

Frameshift mutation

Short answer 1. Define or explain: Lab: BLAST and DNA sequence comparison

3 pts

Short answer 2. Define or explain: Translation

3 pts

Short answer 3. Define or explain: lac operon

3 pts

Short answer 4. Define or explain: Homeotic genes

3 pts

Free response

4 pts

A gene in a bacterium is transcribed only when lactose is present in the growth medium and glucose is absent.

Identify whether this operon is inducible or repressible, and justify your answer.

Explain the role of the repressor protein when lactose is absent.

Explain the advantage to the bacterium of regulating these genes rather than expressing them constantly.