Which of the following accurately describes the chemical makeup of steroid hormones?
Steroid hormones are derived from cholesterol.
Steroid hormones are composed of nucleotides.
Steroid hormones are composed of fatty acids.
Steroid hormones are composed of amino acids.
The Correct Answer is A
A. Steroid hormones are derived from cholesterol.: Steroid hormones originate from cholesterol and share a characteristic four-ring structure derived from that precursor.
B. Steroid hormones are composed of nucleotides.: Nucleotides make up nucleic acids (DNA/RNA); they are not the building blocks of steroid hormones.
C. Steroid hormones are composed of fatty acids.: Steroid hormones are lipid molecules derived from cholesterol rather than straight-chain fatty acids.
D. Steroid hormones are composed of amino acids.: Amino acids form peptide hormones and proteins, not steroid hormones.
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Related Questions
Correct Answer is D
Explanation
A. Growth hormone-releasing hormone (GHRH):GHRH from the hypothalamus stimulates growth hormone release from the anterior pituitary, not thyroid-stimulating hormone (TSH).
B. Gonadotropin-releasing hormone (GnRH):GnRH stimulates the anterior pituitary to release LH and FSH, which regulate the gonads rather than TSH.
C. Corticotropin-releasing hormone (CRH):CRH triggers ACTH release from the anterior pituitary, which acts on the adrenal cortex, not TSH.
D. Thyrotropin-releasing hormone (TRH):TRH from the hypothalamus specifically stimulates the anterior pituitary to secrete TSH, which in turn acts on the thyroid gland.
Correct Answer is A
Explanation
A. B cells:B cells, upon activation, differentiate into plasma cells that synthesize and secrete antibodies that target specific antigens.
B. Macrophages:Macrophages perform phagocytosis and antigen presentation to T cells but do not produce antibodies.
C. T helper cells:T helper cells coordinate the immune response by stimulating B cells and cytotoxic T cells but are not antibody-producing cells themselves.
D. Neutrophils:Neutrophils are first responders in inflammation and bacterial infection but play no role in antibody production.
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