Exam (elaborations)
Mbg 2040 Quiz 9 with 100- correct answers 2025
- Course
- Institution
Mbg 2040 Quiz 9 with 100- correct answers 2025
[Show more]
Content preview
Mbg 2040 Quiz 9 with 100%correct answers 2025
The movement of a hydrogen atom from one position on an organic
molecule to another position on the same molecule is called a: - answer
Tautomeric shift
The widely used method for screening chemicals for mutagenicity is
called: - answer The ames test
The SOS response in E.coli functions to replace damaged regions of DNA
but is a highly error prone process which results in a large number on
mutations. - answer True
Spontaneous mutations occur relatively frequently but often they are
silent, that is they do not produce a phenotypic change. - answer False
Which of the following is an example of a mutagen that acts by donating
alkyl groups to the bases in DNA? - answer Mustard gas
Some mutations have no effect on phenotype, alleles with these mutations
are called: - answer Iso-alleles
Which of the following is NOT a factor which influences the rate of
spontaneous mutation? - answer Environmental/selective pressure
Which of the following chemical mutagens is most likely to cause a
transversion mutation? - answer Proflavin
Which of the following pieces of evidence/statements supports the
concept that "Mutation is non-adaptive"? - answer Mutations conferring
antibiotic resistance in bacteria are present before exposure to the
antibiotic
, Put the following steps of the E.coli Nucleotide excision repair mechanism
in order: - answer 1. Uvr trimer (2 x UvrA and 1 x UvrB) recognises and
binds the damaged DNA.
2. One molecule of ATP is cleaved and energy is used to bend the DNA at
the damaged site; UvrB changes confirmation and the UvrA dimer is
released.
3. UvrC binds the DNA/UvrB complex and cleaves a phosphodiester bond
on either side of the damaged DNA.
4. DNA helicase II releases the excised oligomer. DNA polymerase I
replaces missing nucleotides and DNA ligase seals the nick at the 3' end of
the newly synthesised DNA.
The following DNA sequence 5' -TGCGATCC - 3' is mutated to produce 5' -
TGCGATAC - 3'.
This is an example of which type of mutation? - answer Transversion
UV irradiation causes breaks in chromosomes which can lead to many
different chromosomal abnormalities such as translocations, duplication
and large scale deletions. - answer False
Which of the following chemical mutagens act via it's ability to incorporate
into DNA by replacing a base during replication and causing mispairing in
future replication? - answer 5-bromouracil
1.________ is the ultimate source of genetic variation, 2.__________ provides
new genetic combinations and 3._________ preserves those genetic
combinations which lead to the most reproductive success in a particular
environment. - answer 1. Mutation
2. Recombination
The benefits of buying summaries with Stuvia:
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
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
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 GUARANTEEDSUCCESS. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $15.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
62555 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now