The yolk, which is in many animal eggs, is
composed of
a. a mixture of individual amino acids and
nucleic acids.
b. a mixture of proteins and lipids.
c. a mixture of proteins and carbohydrates.
d. a mixture of nucleic acids and proteins.
e. a mixture of lipids and nucleic acids
B
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In prokaryotes, the 30S pre-rRNA transcript is cleaved into:
A. two rRNAs. B. three RNAs. C. two rRNAs and tRNA. D. three RNAs and tRNA. E. multiple copies of three specific RNAs plus tRNA.
The alpha, beta, and delta cells located in the islets of Langerhans of the thyroid produce three different hormones that are important in the regulation of sodium and potassium levels of the blood
Indicate whether the statement is true or false
Which of the following statements about regulation of thyroid hormones is true?
a) TSH positively feeds back on the hypothalamus causing TRH release b) T3 and T4 negatively feed back on the pituitary to reduce TSH release c) T3 and T4 negatively feed back on the pituitary to reduce TRH release d) TSH negatively feeds back on the hypothalamus to reduce TRH release e) Both b and d are true
In a healthy kidney, glucose and amino acids are reabsorbed into the blood at which location in the nephron?
A) Ureter B) Proximal tubule C) Distal tubule D) Glomerulus E) Nephron loop