Answer the question using the accompanying figure. The degeneration of nuclei is occurring in step(s) ____
a. 4 only
b. 5 only
c. 8 only
d. 4 and 5
e. 4 and 8
ANSWER: e
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People homozygous for the sickle-cell anemia allele develop a life threatening disease, while those homozygous for the normal allele are at the highest risk of dying from malaria. Carriers have some resistance to malaria, but do not develop sickle cell anemia. This is an example of ____
A. founder effect. B. genetic bottleneck. C. heterozygosity. D. heterozygote advantage. E. point mutation.
The RNA copy of DNA that leaves the nucleus and travels to the cytoplasm to make proteins is
A. RNA polymerase. B. ribosomal RNA. C. tRNA. D. mRNA.
As two competing species approach their respective carrying capacities, the growth rate of the other species
A) accelerates. B) is unaffected. C) is doubled. D) slows down.
Digestion in a sponge takes place in:
A. the osculum. B. individual cells. C. the spongocoel. D. the spicule. E. the mesophyll.