All deserts have which of the following in
common?
a. low rainfall amounts
b. uniformly high temperature
c. sand
d. sparse vegetation
e. large leafy plants
A
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How does water move so rapidly across plant cell membranes, and why are red blood cells so
important to the process?
What will be an ideal response?Type I survivorship curves are typical of ____
a. horses only b. chimpanzees only c. mice only d. horses and chimpanzees e. horses, chimpanzees, and mice
Which statement about sperm entry is TRUE?
a. The fertilization cone formed by microvilli of the egg membrane contracts and draws the sperm inward. b. The egg phagocytizes the acrosome of the sperm so it can enter the cell.
c. The cilia on the egg membrane beat and sweep the sperm inside. d. The sperm releases calcium ions, which make the egg membrane permeable to its entry. e. The egg secretes bindin protein, which allows sperm penetration.
Which of the following is not true of heterochromatin?
a. It is highly condensed chromatin. b. There are two forms of it, called constitutive and facultative heterochromatin. c. It is transcriptionally active. d. It is largely localized to the nuclear periphery.