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

Biology & Microbiology

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In prokaryotes, the 30S pre-rRNA transcript is cleaved into:

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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

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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

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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

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