Which of the following is an advantage that ectotherms have over endotherms of the same size?a. They require much less food.b. They are less vulnerable to predation during cold weather.c. They can remain active in cold weather or on cold nights.d. They have higher metabolic rates and grow more quickly.

Which of the following statements is true?

What do host cells provide for viruses?a. ATPb. nucleotides and amino acidsc. ribosomesd. all of the above

Which of the following would increase the rate of heat exchange between an animal and its environment?a. feathers or furb. vasoconstrictionc. wind blowing across the body surfaced.countercurrent heat exchanger

Which of the following is not an adaptation for reducing the rate of heat loss to the environment?a. feathers or furb. increasing blood flow to surface blood vesselsc. huddling behavior of penguinsd. countercurrent heat exchange

The outer surface of a virion consists of either a membranous envelope or a protein capsid. How does the outer surface correlate with a virus's mode of exiting a host cell?

You are studying a large tropical reptile that has a high and relatively stable body temperature. How do you determine whether this animal is an endotherm or an ectotherm?a. You know from its high and stable body temperature that it must be an endotherm.b. You subject this reptile to various temperatures in the lab and find that its body temperature and metabolic rate change with the ambient temperature. You conclude that it is an ectotherm.c. You note that its environment has a high and stable temperature. Because its body temperature matches the environmental temperature, you conclude that it is an ectotherm.d. You measure the metabolic rate of the reptile, and because it is higher than that of a related species that lives in temperate forests, you conclude that this reptile is an endotherm and its relative is an ectotherm.

The metabolic rate of a frog in summer (at 35°C) is about eight times higher than in winter (at 5°C). Compare and contrast the frog's ability to move, exchange gases, and digest food at the two temperatures. During which season will the frog require more food energy, and why?

Explain why most endotherms are homeothermic and most ectotherms are poikilothermic.