The only endocrine gland whose secretory function is under direct control by sympathetic nerves is the:
a. pancreas
b. thyroid
c. adrenal medulla
d. thymus
e. testis
c
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In a long term study by the evolutionary biologists Endler and Reznick, they illustrated the effect of predation on life history traits by studying guppies with different predators: cichlids and killifish. The killifish preys mostly on immature, smaller guppies and cichlids pursue mature, larger guppies. They noticed that in river portions with only killifish, the guppies were larger than in
river portions with only cichlids. How did Endler and Reznick test whether these differences in life history traits were genetic? What will be an ideal response?
The biological species concept:
a. states that any organisms that are biologically similar constitute a species. b. states that a species is any group that shares similar DNA. c. is infrequently used because it is inapplicable to many organisms. d. defines a species as any group of actually or potentially interbreeding species that produce viable offspring. e. is the best and most accurate species concept
Pathogen-associated molecular patterns (PAMPs) are:
a. nonself cues b. antibodies c. complement proteins d. surface proteins on white blood cells e. antigen receptors
Which step of the Krebs cycle requires both NAD+ and ADP as reactants?
A) step 1 B) step 2 C) step 3 D) step 4 E) step 5