All of the following substances are used to preserve foods EXCEPT
A. calcium propionate.
B. sodium nitrite.
C. nisin.
D. biguanides.
E. potassium sorbate.
Ans: D. biguanides.
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Indicate whether the statement is true or false
The study of the distribution of animals and plants around the world is ____
a. diversity b. biogeography c. ecology d. natural history e. environmentalism
The eukaryotic chromosome:
a) condenses only during anaphase of mitosis. b) consists of two linear strands of double-stranded DNA during Gap 2 phase. c) contains no telomeres. d) consists of a single linear strand of double-stranded DNA during Gap 2 phase. e) is usually circular.
Birds are able to sustain long flights at high altitudes because they
A) can extract oxygen during both inhalation and exhalation. B) decrease their heart rate during flight. C) use anaerobic metabolism during flight. D) have thicker blood than other animals, with many more red blood cells. E) are able to lower their body temperature during flight.