Which of the following best explains why anabolic steroid abuse by male athletes can lead to a decrease in testes size?
A) High levels of anabolic steroids cause the adrenal glands to release more estrogen.
B) Circulating anabolic steroids increase the release of FSH and LH, which slow down growth and function of the testes.
C) High levels of anabolic steroids increase the production of testosterone through positive feedback, which decreases the size of the testes.
D) High levels of anabolic steroids decrease the production of testosterone through negative feedback, which decreases the size of the testes.
E) Circulating anabolic steroids decrease the release of FSH and LH, which slow down growth and function of the testes.
D
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Before clotting factors from recombinant DNA became available, more than half of hemophiliacs in the U.S. acquired HIV from injection of clotting factors obtained from donated blood
a. True b. False Indicate whether the statement is true or false
What organ allows for cultures of luminescent bacteria to accumulate?
a. Photic pits b. Endosymbionts c. Photophores d. Chromatophores
Countercurrent flow in the respiratory systems of
fish is a mechanism that accounts for a. oxygen uptake by blood capillaries in the gills. b. ventilation across fish gills. c. the transport of blood from the gills to the fish’s heart. d. the transport of blood from the heart to the fish’s main body mass. e. the flow of blood in gills as opposed to the flow of blood in the main body mass of fish.
At which point or stage would the majority of cells in the embryo no longer be stem cells?
A) the pre-embryo stage B) in the blastocyst C) after the organs start to develop D) A large number of stem cells would exist in all these stages.