100% satisfaction guarantee Immediately available after payment Both online and in PDF No strings attached
logo-home
Previously searched by you
Previously searched by you
logo
MCB 3020 Exam Review Questions with Correct Answers CA$22.48   Add to cart
Quickly navigate to
Preview
  2.  
  3. MCB 3020
  4.  
  5. MCB 3020

Exam (elaborations)

MCB 3020 Exam Review Questions with Correct Answers
 8 views  0 purchase
  • Course
  • MCB 3020
  • Institution
  • MCB 3020

Transcription of the lac operon is very high. - Answer-What is the phenotype of an E. Coli strain with a mutation in the lac operator that prevents the lac repressor from binding? Assume glucose is absent and lactose is present. Attenuation is a common regulatory strategy used to control the tra...

[Show more]

Preview 2 out of 13  pages

Document information

  • October 9, 2024
  • 13
  • 2024/2025
  • Exam (elaborations)
  • Questions & answers

Subjects

  • mcb 3020 exam review questions with correct answer
  • transcription of the lac operon is very high an

Written for

  • MCB 3020
  • MCB 3020

Seller

avatar-seller
lectknancy

Reviews received

Content preview

MCB 3020 Exam Review Questions with
Correct Answers
Transcription of the lac operon is very high. - Answer-What is the phenotype of an E.
Coli strain with a mutation in the lac operator that prevents the lac repressor from
binding? Assume glucose is absent and lactose is present.

Attenuation is a common regulatory strategy used to control the transcription of operons
that code for: - Answer-Amino acid biosynthesis

Phase variation of flagellar proteins in Salmonella enterica involves... - Answer-DNA
rearrangements

A quorum-sensing gene system requires the accumulation of a secreted small molecule
called... - Answer-An Autoinducer

What can be used to control sigma factors? - Answer-Proteolysis
Anti-Sigma factors
Transcriptional regulation

The sigma factor is directly required for... - Answer-Transcription initiation

All of the following are true of transcription initiation EXCEPT:

a) The RNA polymerase holoenzyme binds.
b) GTP hydrolysis catalyzes bubble formation.
c) The closed complex becomes the open complex.
d) The first rNTP is usually a purine.
e) Position +1 marks the start of a gene. - Answer-B) GTP Hydrolysis catalyzes bubble
formation.

The termination of transcription can be caused by which of the following? - Answer-
NusA factor
Rho factor

Peptidyl transferase catalyzes the movement of the peptide from the tRNA in the
(BLANK) to the tRNA in the (BLANK). - Answer-P-site
A-site

The bonding of amino acids by the ribosomes (creating a petide bond) is done by a
protein called peptidyltransferase. - Answer-FALSE

If the first codon in an mRNA is AUG, then the first amino acid in the final, functional
protein is always methionine. - Answer-FALSE

, Mutations in the promoter sequences (-35, -10) of a gene usually affect the strength of
binding for the sigma factor. - Answer-TRUE

Conjugation differs from reproduction because conjugation - Answer-Transfers DNA
horizontally, to cells in the same generation.

Which of the following is not a product of transcription?
a) mRNA
b) A new strand of DNA
c) tRNA
d) rRNA
e) None of the above - Answer-b) A new strand of DNA

(BLANK) prevent transcription, whereas (BLANK) stimulate transcription. - Answer-
Repressors
Activators

Sets of genes in operons are coordinately regulated by all of the following EXCEPT:
a) sigma factors
b) activators
c) small RNAs
d) irreversible changes in the DNA sequence - Answer-d) irreversible changes in the
DNA sequence

(BLANK) genes always occur in intergenic regions. - Answer-sRNA

When (BLANK) interacts with RNA polymerase, it increases the rate of transcription
initiation of the lac operon. - Answer-cAMP receptor protein

What occurs when an inducer is added to a medium containing an organism with a
metabolic pathway controlled by a repressor? - Answer-The inducer combines with the
repressor and inactivates the repressor.

The RNA Holoenzyme is composed of what? - Answer-Core Polymerase- contains
proteins required to elongate the RNA chain.

Sigma Factor- protein needed for initiation of RNA synthesis.

The role of the sigma factor is... - Answer-to recognize the consensus sequences in the
promoter.

Consensus Sequence - Answer-Consists of the most likely base/s at each position of
the predicted promoter. Some positions are highly conserved, while others are less
conserved.

The benefits of buying summaries with Stuvia:

Guaranteed quality through customer reviews

Guaranteed quality through customer reviews

Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.

Quick and easy check-out

Quick and easy check-out

You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.

Focus on what matters

Focus on what matters

Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!

Frequently asked questions

What do I get when I buy this document?

You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.

Satisfaction guarantee: how does it work?

Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.

Who am I buying these notes from?

Stuvia is a marketplace, so you are not buying this document from us, but from seller lectknancy. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for CA$22.48. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

75632 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy study notes for 14 years now

Start selling
CA$22.48
  • (0)
  Add to cart