BCH3025 Exam 4 Questions Well Answers Latest Update 2025-2026
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. - Answers A
Approximately what fraction of the human genome is tranaposable elements?
A) 1.5%
B) 5%
C) 10%
D) 45%
E) 80% - Answers 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. - Answers 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. - Answers 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 -
Answers D
An example of an eicosanoid hormone is:
A) epinephrine.
B) retinoic acid.
C) testosterone.
D) thromboxane.
E) thyroxine - Answers D
An example of a steroid hormone is:
A) epinephrine.
B) retinoic acid.
C) testosterone.
D) thromboxane.
E) thyroxine - Answers 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 - Answers 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. - Answers E
In its role in the hormonal hierarchy, the hypothalamus produces and releases:
A) epinephrine.
B) insulin.
C) progesterone.
D) releasing factors.
E) thyroxine - Answers D
Glucokinase:
A) acts in the conversion of liver glycogen to glucose 1-phosphate.
B) converts fructose-6-phosphate to glucose-6-phosphate
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. - Answers A
Approximately what fraction of the human genome is tranaposable elements?
A) 1.5%
B) 5%
C) 10%
D) 45%
E) 80% - Answers 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. - Answers 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. - Answers 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 -
Answers D
An example of an eicosanoid hormone is:
A) epinephrine.
B) retinoic acid.
C) testosterone.
D) thromboxane.
E) thyroxine - Answers D
An example of a steroid hormone is:
A) epinephrine.
B) retinoic acid.
C) testosterone.
D) thromboxane.
E) thyroxine - Answers 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 - Answers 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. - Answers E
In its role in the hormonal hierarchy, the hypothalamus produces and releases:
A) epinephrine.
B) insulin.
C) progesterone.
D) releasing factors.
E) thyroxine - Answers D
Glucokinase:
A) acts in the conversion of liver glycogen to glucose 1-phosphate.
B) converts fructose-6-phosphate to glucose-6-phosphate
