Which of the following does not occur during mitotic prometaphase?
a. Disappearance of the nuclear envelope
b. Initial movement of chromosomes toward the equatorial plate
c. Adhesion of chromatids at the centromere
d. Synapsis of homologous chromosomes
e. Disappearance of the nuclei
Ans: d. Synapsis of homologous chromosomes
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Examine Figure 44.7 in your text, paying attention to the phylogenetic position of sponges in the two phylogenies presented. If the hypothesis represented by the tree on the right is correct, as some molecular evidence suggests, (select all that apply)
A. sponges are monophyletic. B. sponges are paraphyletic. C. the common ancestor of all animals was sponge-like in appearance. D. we don't know what the common ancestor of all animals looked like. E. none of these.
What is occurring when a transport protein uses energy to pump a solute against its gradient across a cell membrane?
a. osmosis b. passive diffusion c. facilitated diffusion d. turgor e. active transport
When you eat an apple, the core left over is the ovary.
a. true b. false
Some patients who have suffered from polio develop symptoms 30-40 years later in the form of
A. repeated cold symptoms. B. meningitis. C. encephalitis. D. crippling deterioration and dysfunction in the polio-affected muscles. E. deterioration of the nerves that control polio-affected muscles.