Riboswitches are folded RNAs that act as switches to turn protein synthesis on or off in response to ________
A) specific codes from the DNA
B) changes in the environment
C) the presence or absence of ubiquitins
D) specific tRNAs
B
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Ketosis ________.
A. occurs as the concentration of ketones in the urine decreases B. may lead to alkalosis C. occurs when stored fats are rapidly degraded by the body D. stimulates an increased blood pH
Which of the following statements concerning the epidermis is true?
A. The epidermis is nourished by blood vessels located in the dermis. B. The epidermis is very permeable to water-soluble molecules. C. The most numerous cells in the epidermis are the melanocytes. D. The dermis is superficial to the epidermis. E. The epidermis contains numerous blood vessels.
Hormone secretion by the anterior pituitary is controlled by
A. hormones of the thalamus. B. neurohormones of the hypothalamus. C. itself (anterior pituitary) because it is the master gland of the body. D. the overall rate of metabolism. E. neurons from the hypothalamus.
During systemic circulation, blood leaves the
a. left ventricle and goes directly to the aorta. b. right ventricle and goes directly to the aorta. c. right ventricle and moves to the lungs. d. lungs and moves to the left atrium. e. right atrium and goes directly to the lungs.