What is the organelle shown in this illustration?
a. plant cell
b. thylakoid
c. chloroplast
d. vacuole
c. chloroplast
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During a period of low water availability, which prokaryotic structure would protect a cell from dessication (drying out)?
A. pili B. plasma membrane C. nucleus D. cell wall
In humans, the oxygen concentration of the blood is the most important chemical stimulus for
regulating the rate of respiration. ____________________ Indicate whether the statement is true or false.
In pines, an embryo is a(n) _____.
a) food reserve for the immature sporophyte b) immature female gametophyte c) immature sporophyte d) immature male gametophyte seed
If an overlap develops between the ranges of two closely related species, and if the species occupy the same niche in the zone of overlap, what will probably happen in the zone of overlap?
A) A new species will arise by hybridization. B) Both species will coexist, provided the environment in the zone of overlap is different from that in either individual range. C) Both species will coexist, provided the environment in the zone of overlap is similar to that of one of the individual ranges. D) One species will take over most or all of the zone of overlap.