Regulation of Gene Expression

Choose a study mode

Play Quiz
Study Flashcards
Spaced Repetition
Chat to Lesson

Podcast

Play an AI-generated podcast conversation about this lesson
Download our mobile app to listen on the go
Get App

Questions and Answers

Which process is primarily responsible for the lac operon in gene regulation?

  • Transcription of structural genes (correct)
  • Cell division
  • DNA replication
  • Protein translation

In the absence of lactose, what state is the lac operon in?

  • Induced
  • Activated
  • Repressed (correct)
  • Mutated

Which molecule acts as the inducer of the lac operon?

  • Lac repressor
  • Lactose (correct)
  • Glucose
  • RNA polymerase

Which enzyme is responsible for breaking down lactose in the lac operon?

<p>Beta-galactosidase (C)</p>
Signup and view all the answers

Which part of the lac operon acts as an on/off switch for transcription?

<p>Operator (A)</p>
Signup and view all the answers

Which enzyme is responsible for unwinding the DNA double helix during replication?

<p>DNA helicase (C)</p>
Signup and view all the answers

During DNA synthesis, adenine (A) pairs with:

<p>Thymine (T) (A)</p>
Signup and view all the answers

What is the primary enzyme responsible for DNA synthesis?

<p>DNA polymerase (A)</p>
Signup and view all the answers

Which direction does DNA synthesis occur in?

<p>5' to 3' (C)</p>
Signup and view all the answers

Which of the following is not required for DNA synthesis?

<p>Ribosome (D)</p>
Signup and view all the answers

Flashcards

Lac operon regulation

The lac operon is regulated mainly through the transcription of structural genes.

Lac operon state w/o lactose

In the absence of lactose, the lac operon stays in a repressed state, preventing transcription.

Lac operon inducer

Lactose acts as the inducer of the lac operon, triggering gene expression.

Enzyme for lactose breakdown

Beta-galactosidase breaks down lactose into glucose and galactose.

Signup and view all the flashcards

Lac operon on/off switch

The operator region of the lac operon acts as an on/off switch for transcription.

Signup and view all the flashcards

DNA unwinding enzyme

DNA helicase unwinds the DNA double helix at the replication fork.

Signup and view all the flashcards

A pairs with

During DNA synthesis, adenine (A) pairs with thymine (T).

Signup and view all the flashcards

Primary DNA synthesis enzyme

DNA polymerase is the primary enzyme responsible for DNA synthesis.

Signup and view all the flashcards

Direction of DNA synthesis

DNA synthesis occurs only in the 5' to 3' direction.

Signup and view all the flashcards

More Like This

Use Quizgecko on...
Open
Browser
Browser