Genetic drift is the only way deleterious alleles are maintained in a population
a. true
b. false
Answer: b. false
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In liver cells, the inner mitochondrial membranes are about five times the area of the outer mitochondrial membranes. What purpose must this serve?
A) It allows for an increased rate of glycolysis. B) It allows for an increased rate of the citric acid cycle. C) It increases the surface for oxidative phosphorylation. D) It increases the surface for substrate-level phosphorylation. E) It allows the liver cell to have more peroxisomes.
Flagellated protozoans possess a ____, layer of elastic proteins just beneath the plasma membrane
Flagellated protozoans possess a ____, layer of elastic proteins just beneath the plasma membrane.
a. pellicle b. cilium c. capsule d. pilus e. flagellum
In an egg cell treated with EDTA, a chemical that binds calcium and magnesium ions, the
A) acrosomal reaction would be blocked. B) fusion of sperm and egg nuclei would be blocked. C) fast block to polyspermy would not occur. D) fertilization envelope would not be formed. E) zygote would not contain maternal and paternal chromosomes.
In the pine life cycle
A. the cone is the fruit that surrounds the seeds. B. fertilization occurs shortly after pollination to produce the zygote. C. the gametophyte generation is dominant and the sporophyte generation is inconspicuous. D. seed cones are located near the tips of higher branches and pollen cones develop near the tips of lower branches. E. seed cones are smaller than pollen cones.