The type of support illustrated in Figure 40-2 is:
a. a hydrostatic skeleton.
b. an exoskeleton.
c. the integumentary system.
d. a shell.
e. the dermis.
A
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What type of molecule crosses the blood-brain barrier freely?
a. lipid soluble molecules b. glucose c. proteins d. water soluble vitamins e. amino acids
Cancer cells often fail to respond to certain hormones because they lack these cell membrane features important in binding with those specific hormones
A) DNAs B) dockers C) targets D) receptors
A human kidney filters about 200 liters of blood each day. Approximately two liters of liquid and nutrient waste are excreted as urine. The remaining fluid and dissolved substances are reabsorbed and continue to circulate throughout the body. Antidiuretic hormone (ADH) is secreted in response to reduced plasma volume. ADH targets the collecting ducts in the kidney, stimulating the insertion of aquaporins into their plasma membranes and an increased reabsorption of water. If ADH secretion is inhibited, which of the following would initially result?
(A) The number of aquaporins would increase in response to the inhibition of ADH. (B) The person would decrease oral water intake to compensate for the inhibition of ADH. (C) Blood filtration would increase to compensate for the lack of aquaporins. (D) The person would produce greater amounts of dilute urine.
Traits are critical in the study of phylogeny because:
a. A phylogenetic tree is a hypothesis about evolutionary relationships. b. We need to use observation of traits to infer patterns of ancestry and descent among popula-tions. c. By mapping individual traits onto a phylogeny we have already created, we can study the se-quence and timing of evolutionary events. d. B and C. e. A and C.