An experimental male birth control method has been developed that inhibits gonadotropin-releasing hormone (GnRH). Does this drug have the ability to prevent sperm production? Justify your answer
Indicate any potential side effects that might be of concern to a man using this method.
Yes. If GnRH were inhibited, then there would be no release of FSH or LH from the pituitary. Without LH, the testes will not produce testosterone. Without testosterone, no sperm will be made. However, this may not be agreeable to the man because inhibition of testosterone interferes with sperm production and the maintenance of secondary sex characteristics.
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The enzyme succinate dehydrogenase, located in the inner mitochondrial membrane, is directly involved in ____
a. glycolysis and pyruvate oxidation b. pyruvate oxidation and citric acid cycle c. citric acid cycle and electron transfer system d. electron transfer system and glycolysis e. electron transfer system and fermentation
What is the limitation on size in most arthropods?
a. nutrient availability b. habitat population density c. exoskeleton d. depth of the water
Which of the following statements is false?
A) There are more than 60 different kinds of amino acids present in cells. B) The R group of amino acids differs from one amino acid to another. C) Only around 20 amino acids are used in protein synthesis. D) Equal amounts of D- and L-amino acids are found in cells. E) An amino acid has an N-terminus, a C-terminus, and an R group.
Which of the following statements about the function of flowers is TRUE?
A) They provide nutrients to the embryo. B) They protect seeds until they are mature. C) They attract seed dispersers. D) They aid in the dispersal of seeds. E) They attract pollinators.