Marsupials are thought to be most closely related to:
a. placental mammals.
b. monotremes.
c. reptiles.
d. birds.
e. amphibians.
Ans: a. placental mammals.
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This mercury-containing chemical was once found in vaccines and thought to cause autism spectrum disorder (ASD)
A) thiamin B) thimerosol C) PDD-NOS D) thalidomide
A new predator is introduced to an area that can feed on any millipedes shorter than 200 millimeters. No millipedes that live in that area are longer than 15 millimeters. What will happen?
A) Disruptive selection will favor 15-millimeter-long millipedes. B) Millipedes will necessarily evolve to avoid the predator. C) All millipedes will be potential prey. D) Directional selection will favor predators that consume the smallest millipedes. E) The millipedes will necessarily mutate to be longer.
Plasma membranes and some internal membranes have which of the following proteins, which trigger a change in the cell's activities in response to a stimulus?
A. Receptor proteins B. Transport proteins C. Adhesion proteins D. Transmembrane proteins E. Peripheral proteins
In agriculture, male animals are often castrated to modify their behavior and to produce desirable qualities in the meat. What would you predict about hormone levels in castrated male animals?
A. Testosterone is low; follicle stimulating hormone (FSH) and luteinizing hormone (LH) are low. B. Testosterone is high; follicle stimulating hormone (FSH) and luteinizing hormone (LH) are low. C. Testosterone is low; follicle stimulating hormone (FSH) and luteinizing hormone (LH) are high. D. Testosterone is high; follicle stimulating hormone (FSH) and luteinizing hormone (LH) are high.