Which one of the following populations of cells is most markedly increased during bacterial infections?
A) neutrophils
B) red blood cells
C) platelets
D) lymphocytes
E) monocytes
A
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Why don't plant cells use a contractile ring to divide their daughter cells?
A. Plant cells don't have an actin cytoskeleton. B. Plant cells don't form daughter cells. C. A contractile ring can't "pinch" a cell wall. D. Plant cells don't have plasma membranes.
Which cells are important elements that comprise cell-mediated immunity?
A) B cells B) cytotoxic T cells C) plasma cells D) complement proteins
A viral capsid is composed of subunits called:
a. Envelopes b. Nucleic Acids c. RNA d. Coats e. Capsomeres, which are in turn made of protomers
A weed in your garden is flowering. When you look very closely, you notice that what you thought was a single flower is actually a very tightly clustered group of tiny yellow tubular flowers. Upon further inspection, you find that each one of these tiny tubular flowers has petals, sepals, stamens, and a single carpel. What is true about this plant?
A. It has incomplete flowers. B. It has imperfect flowers. C. It has inflorescences. D. It has perfect flowers. E. It has complete flowers.