Filtration occurs in the region labeled____
a. 1
b. 2 only
c. 3 only
d. 4
e. 2 and 3
ANSWER: a
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Which of the following is NOT a desirable characteristic of a model organism used to study development?
A. short generation time B. small size C. large oocytes D. produces many offspring E. large genome
Which molecule initiates translation after an egg is fertilized?
a. maternal mRNA b. paternal promoters in sperm c. maternal transcription factors d. transposable elements e. paternal DNA
One of the most significant steps in the evolution of true cells from macromolecular assemblages was
the evolution of: a. molecular reproduction. b. covalent bonding. c. hydrogen bonding. d. electronegativity. e. valence electrons
Which of the following structures is involved in forming a cleavage furrow?
A) mitotic spindle B) metaphase plate C) contractile ring D) sister chromatids