Synthesis of which of the following compounds in a mature leaf would be least impacted by a temporary soil nitrogen deficiency?
A) DNA
B) RNA
C) amino acids
D) cellulose
D
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Plant cell growth is confined to:
A. flowers. B. meristems. C. within the cell walls. D. photosynthetically active tissues.
Which of the following statements regarding Campylobacter jejuni is incorrect?
A. It produces an enterotoxin that stimulates diarrhea. B. It infects the stomach. C. It is transmitted through ingestion of contaminated chicken, meat, milk, or water. D. It causes fever and a watery to bloody diarrhea. E. The cells are gram-negative, curved rods with darting motility.
The plasma membrane _____
a. controls the contents of the cell b. is composed mostly of cholesterol c. is permeable to ions and polar molecules d. is free of proteins e. is rigid and impermeable
The most likely cells to be lysed when treated with anti-CD4 antibody and complement are
A. Cytotoxic t cells B. Macrophages C. Helper T cells D. B cells