The antibody-mediated immune response is
most effective against
a. cancer cells.
b. viral infected cells.
c. bacteria circulating in the blood.
d. viral infected cells and cancer cells.
e. bacteria circulating in the blood and viral
infected cells
C
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A plant that has the mutant form of the WEREWOLF gene (wer) would be identifiable by
A. the excessive number of vascular bundles in stem. B. the lack of fibers in the outer portions of the stem. C. the abundance of microscopic hairs on the root. D. the extra thick layer of mesophyll cells in the leaf. E. the lack of microscopic hairs along the epidermis of the root.
A human egg can only be fertilized in the ____
a. oviduct b. ovary c. uterus d. cervix e. vagina
No other planet in our solar system has oxygen in its atmosphere. The source of oxygen in our atmosphere is
A. heterotrophic metabolism. B. volcanic eruptions. C. photosynthesis. D. lightning discharge.
Jan van Helmont concluded that plants gain most of their mass from
a) water. b) the soil. c) carbon dioxide in the air. d) oxygen in the air.