DNA Regulation: The Key to Gene Expression and Cellular Function

DNA Regulation: The Key to Gene Expression and Cellular Function

Assessment

Interactive Video

Biology, Science

9th - 12th Grade

Practice Problem

Hard

Created by

Patricia Brown

FREE Resource

The video discusses DNA regulation, explaining how not all genes in an organism's genome are transcribed and translated simultaneously. It highlights differences in gene expression between cell types and environmental conditions. The focus shifts to prokaryotic gene regulation, introducing concepts like promoters, operons, and the role of RNA polymerase. The video further explores mechanisms involving repressors, co-repressors, activators, and inducers, emphasizing their impact on gene expression and the complexity of feedback loops in cellular environments.

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10 questions

Show all answers

1.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What determines whether a gene in an organism's genome is transcribed and translated?

The age of the organism

The size of the genome

The type of cell and environmental factors

The color of the organism

2.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

In prokaryotes, what is the role of a promoter?

To initiate DNA replication

To bind RNA polymerase and start transcription

To terminate transcription

To degrade mRNA

3.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is an operon?

A single gene with multiple promoters

A group of genes regulated by a single promoter

A protein that degrades RNA

A sequence that terminates transcription

4.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is the function of a repressor in DNA regulation?

To initiate DNA replication

To block RNA polymerase from transcribing genes

To enhance transcription

To degrade proteins

5.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Where does a repressor bind to inhibit transcription?

Ribosome

Operator

Promoter

mRNA

6.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

What is a co-repressor?

A molecule that degrades mRNA

A molecule that enhances the function of a repressor

A sequence that terminates translation

A protein that initiates transcription

7.

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

How do inducers affect activators?

They degrade activators

They have no effect on activators

They turn activators off

They turn activators on

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