Differentiation refers to the process by which:
A. fertilized eggs undergo multiple rounds of
cell division to become embryos.
B. changes in gene expression allow cells to
produce the correct proteins at the correct
time.
C. cells become progressively more
specialized during development.
D. gene regulation determines which proteins
are produced in a given cell during
development.
E. None of these choices are correct.
C
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Small size, in general, is necessary for all cells, whether prokaryotic or eukaryotic. Why?
a. The surface area to volume ratio limits the size of all cells. b. If cells were larger, they would be eaten by predators. c. Size is limited by electron orbitals. d. They are limited by the size of the ecosystem.
Autoimmune disorders can result from an inability to produce antibodies.
a. true b. false
The axon hillock in the pre-synaptic neuron fires based on temporal and spatial summation of inputs.
a. true b. false
The inter-tidal zone is a difficult environment for organisms because it has few nutrients
a. true b. false