The most common metabolic waste product is ____
a. urea
b. carbon dioxide
c. ammonia
d. oxygen
e. electrolytes
ANSWER: b
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Which one of the following statements does not accurately describe segregation of the sex chromosomes?
A. In human males, segregation of the X chromosome from the Y chromosome occurs during anaphase I of meiosis. B. In humans, half of the fertilized eggs are expected to be male and half are expected to be female; this 1:1 ratio is characteristic of Mendelian segregation. C. The secondary sex ratio of males to females at birth usually shows a slight excess of males. D. In humans, the sex at each birth is not a random process because there are often large families with either all girls or all boys. E. Females are slightly less likely to survive from conception to birth, but males are slightly less likely to survive from birth to reproductive maturity.
You discover a new species of snail, Biologica terificia, and find that its haploid number is 4 (n = 4). The somatic cells of Biologica terificia are diploid. How many chromosomes are in a somatic cell of the snail in G1 phase?
A) 4 B) 8 C) 16 D) too many to count
The limbic system plays a role in:
a. procedural memory. b. motivation. c. balance and coordination. d. the sleep-wake cycle. e. somatic responses.
The structure of the enzyme active site accounts NOT only for its catalytic activity but also for its ______.
a) ability to bind only one or a small number of closely related biological molecules b) insolvency c) both specificity and the ability to bind only one or a small number of closely related biological molecules d) specificity