Scientists believe that the direction birds go when migrating is guided in part by _____
I) the stars in the night sky
II) the Sun during the day
III) the magnetic field of the Earth
A) only I
B) only II
C) only III
D) only II and III
E) I, II, and III
Answer: E
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Haustoria
A. are a form of parasitic protozoan. B. refers to the reproductive structure formed by slime molds. C. are specialized hyphae used by parasitic fungi. D. are the reproductive form of protozoans.
In the process of blastula formation,
a. the size of individual cells decreases. b. the number of cells increases. c. the total amount of cytoplasm remains about the same. d. the blastula is the same size as the zygote. e. all of these occur.
If we continued to follow the cell lineage from question 4, then the DNA content at metaphase of meiosis II would be
A) 0.25x. B) 0.5x. C) x. D) 2x. E) 4x.
Plasma membranes are selectively permeable. This means that
A) anything can pass into or out of a cell as long as the membrane is intact and the cell is healthy. B) the plasma membrane allows some substances to enter or leave a cell more easily than others. C) glucose cannot enter the cell. D) plasma membranes must be very thick.