BCH3025 Exam 4 UPDATED ACTUAL Exam Questions and CORRECT Answers

BCH3025 Exam 4 UPDATED ACTUAL
Exam Questions and CORRECT Answers
Precursors for the biosynthesis of the pyrimidine ring system include:


A) carbamoyl, phosphate, and aspartate.
B) glutamate, NH3, and CO2.
C) glycine and succinyl-CoA.
D) glycine, glutamine, CO2, and aspartate.

E) inosine and aspartate. - CORRECT ANSWER -A


Approximately what fraction of the human genome is tranaposable elements?


A) 1.5%
B) 5%
C) 10%
D) 45%

E) 80% - CORRECT ANSWER -D


If the structure of a fully relaxed, closed-circular DNA molecule is changed so that the specific
linking difference (σ) is -0.05, the number of:


A) bases is decreased by 5%.
B) bases is increased by 5%.
C) helical turns is decreased by 5%.
D) helical turns is increased by 5%.

E) helical turns is unchanged. - CORRECT ANSWER -C

,A condensed eukaryotic chromosome is known to be associated with all of the following
proteins, except for:


A) core histones H2A, H2B, H3, and H4.
B) histone H1.
C) SMC proteins.
D) topoisomerase I.

E) topoisomerase II. - CORRECT ANSWER -D


One distinction between peptide and steroid hormones is that peptide hormones:


A) act through nonspecific receptors, whereas steroid hormones act through specific receptors.
B) are generally water-insoluble, whereas steroid hormones are water soluble.
C) are more stable than steroid hormones.
D) bind to cell surface receptors, whereas steroid hormones bind to nuclear receptors.
E) bind to their receptors with high affinity, whereas steroid hormones bind with low affinity -
CORRECT ANSWER -D


An example of an eicosanoid hormone is:


A) epinephrine.
B) retinoic acid.
C) testosterone.
D) thromboxane.

E) thyroxine - CORRECT ANSWER -D


An example of a steroid hormone is:


A) epinephrine.

,B) retinoic acid.
C) testosterone.
D) thromboxane.

E) thyroxine - CORRECT ANSWER -C


Some hormones are derived from amino acids; for example, catecholamines are derived from
_____ while NO is derived from ________.


A) tyrosine; arginine
B) tryptophan; lysine
C) tyrosine; histidine
D) tryptophan; arginine

E) histidine; lysine - CORRECT ANSWER -A


The normal sequence of action of these components of the hormonal hierarchy is:


A) adrenal cortex hypothalamus anterior pituitary.
B) anterior pituitary adrenal cortex hypothalamus.
C) anterior pituitary hypothalamus adrenal cortex.
D) hypothalamus adrenal cortex anterior pituitary.

E) hypothalamus anterior pituitary adrenal cortex. - CORRECT ANSWER -E


In its role in the hormonal hierarchy, the hypothalamus produces and releases:


A) epinephrine.
B) insulin.
C) progesterone.
D) releasing factors.

, E) thyroxine - CORRECT ANSWER -D


Glucokinase:


A) acts in the conversion of liver glycogen to glucose 1-phosphate.
B) converts fructose-6-phosphate to glucose-6-phosphate
C) converts glucose 6-phosphate to fructose 6-phosphate.
D) is a hexokinase isozyme found in liver hepatocytes.

E) is found in all mammalian tissues. - CORRECT ANSWER -D


Which of the following is not a fate of amino acids in the liver?


A) Amino acids are incorporated into new proteins.
B) Nitrogen equivalents from amino acids are converted to urea.
C) Carbon equivalents from amino acids are converted to glucose.
D) Amino acids are stored for later use.

E) Amino acids serve as precursors to nucleotide biosynthesis. - CORRECT ANSWER -D


In skeletal muscle, phosphocreatine functions as:


A) a reservoir of Pi for mitochondria.
B) reservoir of high-energy of phosphate to replenish ATP.
C) reservoir of amino acids for protein synthesis.
D) an electron acceptor under anaerobic conditions.

E) None of the above - CORRECT ANSWER -B


In anaerobic skeletal muscle, breakdown of glycogen yields ____ ATP per glucose equivalent.