Methane-producing bacteria belong to
a. archaea
b. prokaryotes
c. eukaryotes
d. urkaryotes
Answer: a. archaea
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Marine biology is the study of:
a. the living organisms that inhabit the sea. b. the oceans and their phenomena. c. the oceans and living organisms. d. the chemical makeup of the oceans. e. biogeochemical processes.
Antidiuretic hormone:
a. promotes processes that lead to an increase in the volume of urine b. makes the distal tubule and collecting ducts more permeable to water c. acts on the proximal tubules of nephrons in the kidney d. is produced by the adrenal cortex e. changes the water permeability of the ascending limb of the loop of Henle
Periderm is produced by:
a. xylem. b. cork cambium. c. pith. d. cortex. e. phloem.
The scrotum is a sac-like structure outside the abdomen in which the testes are suspended. Why is this structure essential?
A. There is too much hormonal influence if they remain in the abdomen. B. Sperm must be closer to the penis to be ejaculated. C. There is not enough space in the abdomen to grow properly. D. Lower temperature is required for normal development of sperm.