Whether the external temperature is hot or cold, birds maintain an internal body temperature of approximately 40?C. This is an example of.
A. metabolism.
B. cellular respiration.
C. growth and development.
D. homeostasis.
E. proteomics.
D. homeostasis.
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A closed-circular DNA in its relaxed form has a linking number (Lk) of 500 . What will happen to the linking number of this molecule if one of the strands is broken?
A. Lk will increase. B. Lk will decrease. C. Lk will stay the same. D. Lk becomes undefined. E. None of these choices is correct.
The ability of some organisms to alter their membrane lipid composition in response to temperature is known as ________.
Fill in the blank(s) with the appropriate word(s).
A buildup of H2CO3 in the blood will lead to
a. alkalosis. b. calcium buildup. c. acidosis. d. hydroxide ion increase. e. HCO3 ? increase.
Which of the following by-products of metabolism is the most toxic?
A) carbon monoxide B) ammonia C) urea D) lactic acid