Nonenveloped viruses most often gain access to eukaryotic host cells by ________.
A. fusion with the host cell plasma membrane followed by entrance of the nucleocapsid into the cytoplasm
B. nucleic acid injection through the plasma membrane
C. pinocytosis
D. endocytosis
Answer: D
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The convergence in external morphology of sharks, penguins, and porpoises is attributed to
a. reduced genetic variability in these groups. b. selection pressures that are common to these groups. c. reproductive isolation of these groups. d. identical genes in all three groups. e. use and disuse of the limbs.
Shoots and roots consist of __________, __________, and __________ tissue systems. Fill in the blank(s) with the appropriate word(s)
Which of the following is paired incorrectly?
A. plants; cellulose cell wall B. algae; chitin C. bacteria; peptidoglycan cell wall D. fungi; polysaccharide cell wall E. archaea; protein cell wall