Biochemistry and Physiology Quiz 14

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Question 1 of 20

1. Question

During swallowing, food may become temporarily lodged in which structures near the pharynx?

Vallecula
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Pyriform recess
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Salpingopharyngeal fold
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A and B
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All of the above
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Question 2 of 20

2. Question

All of the following are true about the urea cycle EXCEPT:

Occurs in hepatocytes
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Requires aspartate
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Eliminates ammonia
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Produces urea
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Produces 3 ATP
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Question 3 of 20

3. Question

All of the following are true of antidiuretic hormone (ADH) EXCEPT:

it is released from the posterior pituitary gland.
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it increases water reabsorption.
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its release is stimulated by increased thirst.
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it functions primarily at the collecting duct.
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all are true of ADH.
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Question 4 of 20

4. Question

Statement 1: Eccrine sweat glands are controlled by postganglionic sympathetic cholinergic neurons. Statement 2: Apocrine sweat glands produce pheromones.

Both statements are true.
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Both statements are false
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The first statement is true; the second statement is false.
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The first statement is false; the second statement is true.
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Question 5 of 20

5. Question

Statement 1: Each tRNA contains an anticodon. Statement 2: tRNA is the least prevalent RNA.

Both statements are true.
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Both statements are false
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The first statement is true; the second statement is false.
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The first statement is false; the second statement is true.
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Question 6 of 20

6. Question

Which of the following is the most important factor in determining the affinity of hemoglobin (Hb) for oxygen binding?

$\text{PCO}_2$
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$\text{PO}_2$
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. $\text{pH}$
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Hb concentration
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Temperature
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Question 7 of 20

7. Question

Place the following events of protein synthesis in chronological order: 1. Splicing of exons, 2. Small ribosomal subunit binding to mRNA, 3. RNA polymerase activity, 4. Anticodon binding to complementary codon, 5. Transfer of mRNA from the nucleus to cytoplasm.

RNA polymerase activity, small ribosomal subunit binds to mRNA, splicing of exons, anticodon binds to complementary codon, transfer of mRNA from the nucleus to cytoplasm
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Transfer of mRNA from the nucleus to cytoplasm, splicing of exons, small ribosomal subunit binds to mRNA, anticodon binds to complementary codon, RNA polymerase activity
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RNA polymerase activity, splicing of exons, transfer of mRNA from the nucleus to cytoplasm, anticodon binds to complementary codon, small ribosomal subunit binds to mRNA
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Transfer of mRNA from the nucleus to cytoplasm, small ribosomal subunit binds to mRNA, RNA polymerase activity, anti-codon binds to complementary codon, splicing of exons
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RNA polymerase activity (3), splicing of exons (1), transfer of mRNA from the nucleus to cytoplasm (5), small ribosomal subunit binding to mRNA (2), anticodon binding to complementary codon (4).
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Question 8 of 20

8. Question

If the left side of the spinal cord was damaged (hemisection), an individual would lose which classic functions?

Right-side pain and temperature sense, and left-side motor function
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Left-side pain and temperature sense, and left-side motor function
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Left-side pain and temperature sense, and right-side motor function
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Right-side pain and temperature sense, and right-side motor function
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Question 9 of 20

9. Question

Statement 1: The stretch reflex is mediated by muscle spindle receptors. Statement 2: It results in skeletal muscle relaxation.

Both statements are true.
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Both statements are false.
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The first statement is true; the second statement is false.
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The first statement is false; the second statement is true.
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Question 10 of 20

10. Question

Citrullinemia is a disorder of urea synthesis caused by a defect in which enzyme?

Phenylalanine hydroxylase
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Homogentisate oxidase
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Methionine synthase
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Argininosuccinate synthase
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Tyrosine aminotransferase
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Question 11 of 20

11. Question

Which of the following hormones or releasing factors are released by the hypothalamus?

TRH
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GHRH
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GnRH
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A and C
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All of the above
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Question 12 of 20

12. Question

All of the following would likely result in an individual with severe anemia EXCEPT:

fatigue
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cyanosis
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hypoxia
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increased cardiac output.
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pulmonary vasoconstriction.
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Question 13 of 20

13. Question

All of the following are true of purines EXCEPT:

Synthesized from ribose-5-phosphate
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Include adenine and guanine
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Catabolized to acetyl-CoA
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Pair with pyrimidines
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Cyclic structures composed of nitrogen and carbon
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Question 14 of 20

14. Question

Thyroglobulin is a glycoprotein largely consisting of which amino acid residue, incorporated into thyroid hormones?

Tryptophan
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Arginine
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Lysine
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Proline
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Tyrosine
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Question 15 of 20

15. Question

The immersion of cells in a hypotonic solution will result in which of the following?

Cellular swelling
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Cellular shrinkage
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No change
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None of the above
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Question 16 of 20

16. Question

Statement 1: Exocytosis is the process by which cells release macromolecules to the ECM. Statement 2: Pinocytosis is a type of exocytosis.

Both statements are true.
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Both statements are false.
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The first statement is true; the second statement is false.
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The first statement is false; the second statement is true.
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Question 17 of 20

17. Question

All of the following molecules stimulate osteoclastic activity or maturation EXCEPT:

$\text{IL}-1$.
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$\text{TNF}-\beta$.
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$\text{IL}-8$.
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$\text{PTH}$.
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$\text{RANKL}$.
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Question 18 of 20

18. Question

Which of the following is NOT TRUE of the Entner-Doudoroff pathway (EDP)?

Produces 1 ATP per glucose
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Coverts glucose to pyruvate
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Occurs in hepatocytes
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Produces 1 NADH
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Produces glyceraldehyde-3-phosphate
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Question 19 of 20

19. Question

Intrinsic factor, secreted in the stomach, is essential for the absorption of which vitamin in the small intestine?

Vitamin $\text{B}_1$
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Vitamin $\text{B}_2$
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Vitamin $\text{B}_3$
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Vitamin $\text{B}6$
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**Vitamin $\text{B}{12}$ (cobalamin)**
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Question 20 of 20

20. Question

During skeletal muscle contraction, calcium binds to which regulatory protein?

Tropomyosin
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Actin
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Calmodulin
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Myosin
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Troponin
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Biochemistry and Physiology Quiz 14

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