Mini Quiz 4: Lac operon

Mini Quiz 4: Lac operon

12th Grade

6 Qs

quiz-placeholder

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Mini Quiz 4: Lac operon

Mini Quiz 4: Lac operon

Assessment

Quiz

Biology

12th Grade

Easy

Created by

DELIA Moe

Used 2+ times

FREE Resource

6 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is meant by an operon in DNA?

A collection of genes that perform the same function

A functioning unit of DNA containing a cluster of genes controlled by a single regulatory signal or promoter

A region on DNA which can affect the whole organism

A process where genes in an organism can affect other genes

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The lac operon is found in ___ and the proteins produced are involved in metabolism of ____.

human colon cells ; glucose

fungi ; galactose

plants ; starch

bacteria ; lactose

3.

DRAG AND DROP QUESTION

1 min • 1 pt

In the presence of lactose, the lac operon will be switched ​ (a)   , ​ (b)   of structural genes will be transcribed and the ​ (c)   will be produced.

on
mRNA
enzymes
DNA
off
tRNA
promoter
RNA polymerase
operator
repressor

4.

REORDER QUESTION

1 min • 1 pt

Reorder the following

RNA polymerase is unable to bind to promoter.

No transcription of structural genes occur, no enzymes are produced.

lacI gene is transcribed and translated into repressor protein.

In the absence of lactose, repressor protein binds to operator.

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of the following statements are FALSE?

In the presence of lactose, lac operon is switched on.

Lactose will convert into allolactose before binding to repressor.

Enzymes beta-galactosidase, permease & transacetylase are not produced in the presence of lactose.

In the presence of lactose, RNA polymerase can bind to promoter of lac operon.

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What happens to the lac operon if the lacI gene is mutated?

Repressor protein may be non-functional.

Structural genes cannot be transcribed.

RNA polymerase cannot bind to promoter.

It does not affect the lac operon.