When two species of trout that breed in different seasons are considered, which type of reproductive barrier is involved?
a. gametic
b. temporal
c. behavioral
d. habitat
e. mechanical
Answer: b. temporal
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Four of the five answers are important evolutionary adaptations in primates. Select the exception
a. forward facing eyes b. upright walking c. grasping hands d. the development of a restricted or specialized diet e. brain expansion and elaboration
A protein that guides the folding of a polypeptide into a functional, three-dimensional shape, converting the
polypeptide into a protein is called a(n) ____________________. Fill in the blank(s) with the appropriate word(s).
Which of the following supports the finding that sugar translocation in phloem is an active (energy-requiring) process?
A) Sucrose occurs in higher concentrations in companion cells than in the mesophyll cells where it is produced. B) Movement of water occurs from xylem to phloem and back again. C) Strong pH differences exist between the cytoplasm of the companion cell and the mesophyll cell. D) ATPases are abundant in the plasma membranes of the mesophyll cells.
A characteristic of annelids is:
A) parasitism. B) body segmentation. C) ocean-dwelling existence. D) freshwater existence. E) a radula.