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GBS 707 Week 4 Questions and Correct Answers the Latest Update $12.49   Add to cart

Exam (elaborations)

GBS 707 Week 4 Questions and Correct Answers the Latest Update

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  • GBS 707

Which of the following is a TRUE statement? A. Uracil is the same as thymine except for a single amine group B. Adenine and guanine are pyrimidines C. The glycosidic bond links a nitrogen and a carbon atom D. Deoxynucleosides lack 3' hydroxyl groups C. The glycosidic bond links a nitrogen and...

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  • November 7, 2024
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  • GBS 707
  • GBS 707
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GBS 707 Week 4 Questions and Correct
Answers the Latest Update
Which of the following is a TRUE statement?

A. Uracil is the same as thymine except for a single amine group

B. Adenine and guanine are pyrimidines

C. The glycosidic bond links a nitrogen and a carbon atom

D. Deoxynucleosides lack 3' hydroxyl groups


✓ C. The glycosidic bond links a nitrogen and a carbon atom



Which of the following statements about nucleotide metabolism is FALSE?

A. Ribonucleotide reductase is needed to remove the 2' hydroxyl of nucleotides

to make precursors for DNA

B. Pyrimidine bases made de novo are entirely built while attached to ribose

C. Purine nucleotides act as inhibitors of enzymes in the de novo purine

synthesis pathway

D. Glutamine acts as a nitrogen donor during de novo purine synthesis


✓ B. Pyrimidine bases made de novo are entirely built while attached to ribose



The 5 methyl group that distinguishes thymine from uracil comes from the

following conversion

A. Serine to Glycine
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B. Valine to Alanine

C. Phenylalanine to Tyrosine

D. Glutamate to Aspartate


✓ A. Serine to Glycine



Which best describes a plausible mechanism for ADA mutations causing Severe

Combined Immunodeficiency?

A. Immune cells die due to blockage of pyrimidine biosynthetic pathways

B. Adenine buildup in immune cells inhibits ribonucleotide reductase

C. Dihydrofolate reductase is inhibited in immune cells leading to

underproduction of thymine

D. Fluorinated compounds are introduced into DNA killing immune cells


✓ B. Adenine buildup in immune cells inhibits ribonucleotide reductase



Which chemical designation for the following purines is CORRECT?

A. 6 oxy-purine is Guanine

B. 6 amino-purine is Guanine

C. 2 amino-6 oxytocin's purine is Guanine

D. 2 oxy-purine is Guanine


✓ C. 2 amino-6 oxytocin's purine is Guanine



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