Spermatogenesis in males produces _____ viable sperm
Fill in the blank(s) with the appropriate word(s).
Answer: 4
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Which of the following type of microscopy would be most effective in visualizing the fine structure of viruses and cytoskeletal filaments 10–25 nanometers in diameter?
A. standard light microscopy B. phase-contrast light microscopy C. transmission electron microscopy D. darkfield light microscopy E. differential-interference microscopy
Which scenario would be a modern example of Lamarckianism?
A. A strain of houseflies resistant to insecticides emerges. B. Squirrels separated by a river are found to be unable to interbreed. C. A son is born with a portion of his right index finger missing—the same portion that was severed from his father's hand in an accident. D. A species of lizards shows changes in diet and body shape after being moved to a nearby island. E. Snails are found to have thicker shells after the introduction of a predator.
According to the figure, what is the only hormone that doesn't peak during ovulation?
A. FSH B. progesterone C. all female reproductive hormones peak at ovulation D. LH E. estrogen
Answer the following questions true (T) or false (F)
1. Cleavage and gastrulation take place in animals such as humans and birds but not in frogs. 2. Early vertebrate embryos share a general similarity in shape in the period following somite development. 3. Cells first arrange themselves into layers during organogenesis.