Mast cells release histamine.
a. true
b. false
Answer: a. true
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Which of the following is the BEST definition of a homologous chromosome?
a) a chromosome that has undergone crossing over b) one of two identical chromosomes held together by a centromere c) the central area that joins two chromatids d) the type of chromosome found in prokaryotes e) one of two chromosomes of the same length and type inherited from a father or mother
Which of the following would NOT be an example of negative feedback control in homeostasis?
A. Blood volume and pressure drop due to bleeding. This decreased pressure causes the kidneys to increase water reabsorption to increase blood volume and pressure. B. Exposure to cold water causes body temperature to drop. Decreased stimulation of heat receptors causes constriction of blood vessels near the skin and better retention of heat. C. Glucose levels rise following consumption of a big dessert, triggering release of insulin which causes glucose levels to fall. D. During the birth process, stretch receptors in the uterus stimulate the release of oxytocin from the pituitary gland. This hormone stimulates uterine muscle contraction that increases stimulation of the stretch receptors. E. Blood levels of glucose fall during sustained exercise, causing the release of glucagon which stimulates the release of glucose into the blood.
Ultraviolet (UV) light-treated bacteria would most likely have DNA damage in the form of
A) analog incorporation. B) pyrimidine dimer formation. C) intercalation of the bases. D) direct transition of the bases. E) deamination.
Most pH buffers are ____
a. strong acids b. weak acids or weak bases c. weak acids d. strong bases e. strong acids or strong bases