What is the key step in spermatogenesis that allows for unlimited sperm production? This step is not present in oogenesis, and therefore only a finite number of eggs could be produced
What will be an ideal response?
The diploid germ-line cells (pre-sperm cells) of the testes divide initially by mitosis producing two daughter cells. Only one becomes the primary spermatocyte and enters meiosis; the other daughter cell is retained as a germ-line cell. Therefore, the testes could never run out of germ-line cells. That preliminary mitotic division is missing in oogenesis, resulting in a finite number of eggs, although it is still more than a person would ever need in her lifetime.
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A. Rubisco B. NADPH C. ATP D. O2 E. PSII
What type of sensory receptor is a hair cell?
A. nociceptor B. electroreceptor C. mechanoreceptor D. chemoreceptor
The initial experiment of Koga and Fugatsu, in testing for any bacterial cause of aphid color change, involved all of these except
A. the specific amounts of red and green pigment molecules were initially measured as dependent variables. B. a group of green aphids was grown, then killed in order to produce an extract to test on red aphids. C. a group of red aphids was treated with the independent variable of Rickettsiella bacteria infection from green aphids. D. a group of red aphids was grown as a control group. E. a group of aphids infected with Rickettsiella bacteria was grown, then killed in order to produce an extract to test on red aphids.
The "endosymbiont theory" states that eukaryotic cells work together to form a multicellular organism.
a. true b. false