Which of the following is the highest, most inclusive category?
A. family
B. phylum
C. genus
D. order
Answer: B
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In a longitudinal section of a nerve cell, at the presynaptic site you note a variety of vesicles that are anchored to the plasma membrane. The vesicles must be specialized for
A) constitutive secretion. B) regulated secretion. C) polarized secretion. D) zymogen secretion. E) none of the above
Which male organism contains two identical sex chromosomes?
a. turtles b. birds c. chimpanzees d. dogs e. lizards
A plant species has its DNA analyzed. The results show that 28% of its nitrogen bases are guanine. What is the percent represented by thymine?
A. 22% B. 28% C. 56% D. 23%
Using a light microscope, it is easiest to see chromosomes:
a) during interphase because they are uncoiled and have a more linear structure. b) during sexual reproduction. c) during mitosis and meiosis because the condensed chromosomes are thicker and therefore more prominent. d) during asexual reproduction. e) during interphase when they are concentrated in the nucleus.