T cells attack
A. transplanted tissue cells from one host to another.
B. cancer cells.
C. host cells that have been parasitized by microorganisms.
D. All of the choices are correct.
Answer: D
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Microbes playing a role in nitrogen fixation in plants live in ________, while those playing a role in the digestive tract of certain herbivores live in ________
A) rumens / nodules B) nodules / rumens C) nodules / fortrans D) fortrans / rumens
Which of the following statements is true?
A. Integrins and cadherins facilitate cell adhesion to extracellular substrates. B. Cadherins on the surface of animal cells permit the adhesion of cells to other cells. C. Cadherins are used by plant cells to attach the plasma membrane to the cell wall. D. Integrins on one cell attach to cadherins on another cell to promote cell adhesion.
Soil water enters the root through the root ________.
A. Xylem B. Phloem vessels C. Epidermis D. Endodermis E. Cortex
Which of the following is found in nucleic acids?
A) amines B) carboxylic acid C) purines D) glycerol E) R group