Generally, vaccines are used to stimulate the immune system by providing antigens of potential pathogens. What is the typical composition of a vaccine?
A) genes encoding for virulence factors B) RNA from bacteria
C) naked DNA D) inactivated or attenuated viruses
Answer: D
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a. fertilization, germination, pollination. b. germination, pollination, fertilization. c. pollination, fertilization, germination. d. pollination, germination, fertilization
The most prominent known role in the opening and closing of stomata is played by____ ions
a. Ca2+ b. Cl? c. K+ d. NH4+ e. Na+
The presence of wings in butterflies, moths, bats, and birds is an example of _______.
A. Homology B. Homoplasy C. An ancestral trait D. A synapomorphy
Ribonucleic acid (RNA) differs from deoxyribonucleic acid (DNA) in the structure of its _____.
A) sugar B) phosphate C) bases D) bonds