Arrange the stages of sperm development in chronological order
1) sperm
2) spermatid
3) primary spermatocyte
4) secondary spermatocyte
5) spermatogonium
a. 5 ? 2 ? 3 ? 4 ? 1
b. 5 ? 3 ? 4 ? 2 ? 1
c. 2 ? 3 ? 4 ? 1 ? 5
d. 2 ? 5 ? 3 ? 4 ? 1
e. 3 ? 4 ? 5 ? 2 ? 1
b
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In mosses, the zygote grows and develops into a sporophyte while remaining attached to and nourished by its ____
a. sperm-producing sporophyte parent b. sperm-producing gametophyte parent c. egg-producing sporophyte parent d. egg-producing gametophyte parent e. own photosynthetic leaf-like parts
Aerobic respiration became established as a result of the evolution of ____
a. the first protocells b. the first true cells c. metabolism d. the nuclear envelope e. the oxygen-producing pathway of photosynthesis
When G2 and M phase cells were fused together, the G2 nucleus became prematurely compacted when it was exposed to S phase cytoplasm in the fused cell. The G2 chromosomes could be seen to be visibly doubled. What conclusion was drawn from this result?
a) M phase cytoplasm contained diffusible factors that initiate DNA synthesis b) G2 nuclei cannot respond to diffusible factors present in M-phase cell cytoplasm c) the cytoplasm of the mitotic cell contained diffusible factors that could induct mitosis in a non-mitotic cell d) the cytoplasm of the G2 cell contained diffusible factors that could halt mitosis in a mitotic cell
What is the basis of natural selection?
A. a change in the appearance of a species over time B. individuals passing on their traits to their offspring C. unequal reproductive success D. the accumulation of favorable traits in a population