The term that is the culmination of coitus is ____
a. sexual arousal
b. fertilization
c. ejaculation
d. orgasm
e. sexual intercourse
ANSWER: d
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The water vascular system of the sea star ________
a. is based on ampullae inside each of the tube feet, which contract to lengthen the foot for locomotion b. is a simple digestive system that expels coarse, undigested residues through the mouth c. is an open circulatory system d. flushes millions of eggs from the gonad
________ reactions require an input of energy when electrons are gained, such as in the conversion CO2 ? CH4
Fill in the blank with correct word.
Plant viruses ________
A) often use RNA, rather than DNA, as their genetic material B) benefit plants, rather than causing disease C) cause diseases that can be easily cured D) do not exist, as viruses attack only animals
What regulates the expression of most eukaryotic genes
a. silencing complexes b. miRNA c. transcription factors d. dicer enzymes