Energy is defined as
A. heat.
B. the capacity to do work.
C. change.
D. movement.
B. the capacity to do work.
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Which of the following describes the postembryonic development, called complete metamorphosis, in members of the order Diptera (flies)?
a. a single, wingless nymph instar followed by several winged adult instars b. a series of young instars that become more and more like an adult, ending with a wingless adult instar c. a series of nymph instars that lack functional wings, ending with an adult instar with functional wings d. several instars of often wormlike larvae, followed by a stage where they are a sessile pupa, and then ending in an adult stage that is very different from the larval instars
Which of the following is the result of gastrulation?
A) A three-layered embryo B) A blastula C) A hollow ball of cells D) The formation of organs E) A zygote
Bacteria tend to stain more readily with cationic(positively change) dyes because bacteria.
A. contain large amounts of acidic substance B. have thick cell walls C. are neutral D. contain large amounts of alkaline substance.
What observation(s) would distinguish a dividing animal cell from a dividing plant cell?
A) decondensing chromosomes positioned at opposite poles of the spindle B) a bipolar spindle constructed from microtubules C) the presence of centrioles would be a feature unique to plant cells D) a constriction in the plasma membrane forming along the spindle equator E) all of the choices are unique to animal cells