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
USABO Open Exam (4) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution £6.54
Add to cart
Quickly navigate to
Preview
  2.  
  3. USABO
  4.  
  5. USABO
  6.  
  7. USABO

Exam (elaborations)

USABO Open Exam (4) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

 0 purchase

USABO Open Exam (4) Questions with 100% Actual correct answers | verified | latest update | Graded A+ | Already Passed | Complete Solution

Preview 2 out of 11  pages

Document information

  • June 20, 2024
  • 11
  • 2023/2024
  • Exam (elaborations)
  • Questions & answers

Subjects

  • usabo open exam 4 questions with 100 actual cor

Written for

All documents for this subject (576)

Seller

avatar-seller
DoctorHkane

Reviews received

Content preview

USABO Open Exam
Which statement is true about enzymes? Enzymes

A. Are made up of a base containing nitrogen, phosphate, and ribose.
B. Have activity that is independent of temperature and pH.
C. Lose some or all of their normal activity when their 3-D structure is disrupted.
D. Provide the activation energy needed to activate a reaction.
E. Work once only and then are destroyed. - ANS-C. Lose some or all of their normal
activity when their 3-D structure is disrupted.

You have a multicellular organism that reproduces asexually by fission. When you
excise a ~10,000 cell portion of its body, both the original organism and the excised
portion grow into fully formed, healthy organisms. You take one of the offspring and
repeat the procedure for one hundred and twenty-three generations. Each time, the
resulting organisms are healthy. What must be true of the nuclei of this species?

A. The cells contain plasmids.
B. The cells have multiple forms of DNA polymerase.
C. The cells have the majority of their genome stored in circular DNA.
D. The cells contain active telomerase.
E. The cells contain active fissonase. - ANS-D. The cells contain active telomerase.

Which of the following correctly describes how the lifespan of a protein is regulated?

A. The part of the sequence coded for by the UTR tags it for destruction.
B. Giant protein complexes called ubiquitins destroy proteins after they have remained
in the cell for a certain time.
C. Proteins are methylated over time; heavily methylated proteins are destroyed by
proteasomes.
D. Proteins are tagged with ubiquitins, which are recognized by proteasomes; the
proteasomes destroy the proteins.
E. Proteins tagged with methyl groups are destroyed by ubiquitins. - ANS-D. Proteins
are tagged with ubiquitins, which are recognized by proteasomes; the proteasomes
destroy the proteins.

Of the following amino acids, which is least likely to form strong interactions with other
amino acids that contribute to the tertiary structure of a given protein?

, A. Histidine
B. Glutamate
C. Cysteine
D. Glycine
E. Serine - ANS-D. Glycine

Thymine dimers arise when two adjacent thymine bases become covalently linked. This
interferes with normal DNA geometry and will cause replication errors. Which of the
following agents is the primary cause of the thymine dimers?

A. Chemical mutagens
B. Beta emissions from radioactive decay
C. Gamma rays
D. X-rays
E. UV rays - ANS-E. UV rays

Which of the following oligonucleotides would have the highest melting point when
paired with the proper complementary strand?

A. 5'-AAAAAAAA-3'
B. 5'-ATGCATGC-3'
C. 5'-CGCGCGCG-3'
D. 5'-TTTTGGGG-3'
E. 5'-TATATATA-3' - ANS-C. 5'-CGCGCGCG-3'

Which of the following is a way in which the cell increases gene expression in the
nucleus?

A. Acetylation of histone tails
B. DNA methylation
C. Locating a gene within heterochromatin
D. Dephosphorylating DNA
E. Alternative splicing - ANS-A. Acetylation of histone tails

Which of the following statements about cellular ultrastructure is FALSE?

A. Nonmotile eukaryotic cilia are composed of 9 doublets of microtubules in a ring, with
no microtubules in the center ('9+0').
B. Bacterial flagella are composed of 9 doublets of microtubules in a ring, with two
microtubules in the center ('9+2').

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 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 DoctorHkane. Stuvia facilitates payment to the seller.

Will I be stuck with a subscription?

No, you only buy these notes for £6.54. You're not tied to anything after your purchase.

Can Stuvia be trusted?

4.6 stars on Google & Trustpilot (+1000 reviews)

67479 documents were sold in the last 30 days

Founded in 2010, the go-to place to buy revision notes and other study material for 15 years now

Start selling
£6.54
  • (0)
Add to cart
Added