Which of the following events occur during anaphase I of meiosis?
A. The chromosome number is doubled
during this phase of meiosis.
B. In females, the two X chromosomes
remain together.
C. In males, the X chromosome is segregated
from the Y chromosome.
D. The centromeres of the chromosomes
divide.
E. Homologous chromosomes move as one
unit.
C
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All Prochlorococcus strains contain
A) chlorophylls a and b. B) chlorophyll a and phycobilins. C) chlorophyll b and phycobilins. D) chlorophylls a and b and phycobilins.
Which one of the following is a variation of flowers frequently considered in investigations of flowers and their functions?
A. fragrance B. color C. shape D. number of parts E. All of these are true
Select the correct sequence of animal
developmental events.
a. fertilization >>> cleavage >>> organ formation >>> growth of tissues b. fertilization >>> cleavage >>> gastrula >>> organ formation c. fertilization >>> gastrula >>> cleavage >>> organ formation d. fertilization >>> organ formation >>> gastrula >>> cleavage e. fertilization >>> organ formation >>> cleavage >>> gastrula
Which of the following proteins are likely to act as gene activators?
(a) factors X and Y (b) factors X and Z (c) factors Y and Z (d) factor X only