This animal lacks symmetry, has no embryonic
tissues, and has intracellular digestion. It is
___.
a. a cnidarian
b. a flatworm
c. a sponge
d. an annelid
e. more than one of these
C
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Both walnut and Gingko trees lose their leaves in the fall when day length starts decreasing. Based on these observations one may conclude that many tree species will lose their leaves in the fall in response to decreasing day length. This statement is an example of:
A. inductive reasoning B. a theory C. deductive reasoning D. an experiment
The actions of insulin and glucagon are ____
a. synergistic b. permissive c. cooperative d. antagonistic e. mutualistic
Fertilization in all animal species results in formation of a fertilization envelope which:
A. Prevents the zygote from dehydrating B. Prevents more sperm from fertilizing the same egg C. Permits the egg to implant in the uterine wall
Transcription factors attach to
A) DNA. B) the nuclear envelope. C) plasma membrane receptors. D) mRNA.