Biology · Unit 6 · Paper 3

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 1 Paper 2 Paper 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 3” 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

PCR

Start and stop codons

lac operon

Alternative splicing

Topoisomerase

Plasmid

Universality of the genetic code

Point mutation types

Promoter and TATA box

trp operon

RNA processing

Origin of replication

Short answer 1. Define or explain: Regulatory vs structural genes

3 pts

Short answer 2. Define or explain: Homeotic genes

3 pts

Short answer 3. Define or explain: DNA polymerase

3 pts

Short answer 4. Define or explain: Translation

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.