Threadlike bits of protein attached to the inner surface of the nuclear envelope serve to
a. assist in molecular transport through the membrane.
b. help the cell move
c. aid in passage of ribosomes out of the nucleus
d. anchor DNA molecules to the envelope and keep them organized.
e. Stabilize the nuclear envelope.
D
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Which of the following is true of prokaryotes?
A. Prokaryotes have a nucleus. B. Prokaryotes are single-celled. C. Prokaryotes do not have a chromosome. D. Prokaryotes have membrane-bounded organelles. E. Prokaryotes do not have ribosomes.
Describe the shared derived characteristics that support grouping the hemichordates, chordates, and
echinoderms together as deuterostomes. What will be an ideal response?
The temperature at which an alligator's egg is incubated will determine the sex of the offspring. The dependent and the independent variables in this experiment are ________.
Fill in the blank(s) with the appropriate word(s).
The neural plate forms from which type of tissue?
a. ectoderm b. endoderm c. mesoderm d. chorion e. amnion