The cell in the accompanying illustration is in ____
a. prophase I.
b. metaphase I.
c. anaphase I.
d. prophase II.
e. anaphase II.
ANSWER: b
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LUCA, the last universal common ancestor, is:
A. a prehistoric protozoan cell. B. an embryonic cell (in fetus). C. the simplest bacterial cell. D. a cell from which all organisms descended.
Research on the aging process shows that wounds of the elderly heal more slowly and that they are more susceptible to disease. These are problems associated with an aging ________ system
A) respiratory B) immune C) integumentary D) digestive E) endocrine
The prokaryotes that cause tooth decay have a ________ relationship with humans
A) parasitic B) predatory C) mutualistic D) competitive
In recessive lethal diseases such as Tay-Sachs disease, carriers have one copy of the normal allele and one copy of the allele for the disease. Carriers are represented in the Hardy-Weinberg formula by ________.
A. 2pq B. 1 - q C. the Hardy-Weinberg equilibrium D. the frequency of homozygous dominants plus frequency of heterzygotes plus the frequency of homozygous recessives