A unique characteristic of plant cells is their
a. ability to photosynthesize.
b. ability to carry out cellular respiration.
c. ability to continuously grow and generate new organs throughout their life cycle.
d. ability to form defensive compounds.
e. ability to protect themselves through movement
C
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Which of the following statements about the cell-mediated response is false? a. Cyotoxic T cells touch-kill any body cells that display viral antigen-MHC complexes on their surfaces
b. A dendritic cell that engulfed a sick body cell displays antigen from that cell, becoming an antigen-presenting cell. c. Activated cytotoxic T cells differentiate into memory cytotoxic T cells and effector helper T cells. d. Naive helper T cells bind to antigen-MHC complexes on dendritic cells.
Cartilage lacks
a. matrix. b. collagen. c. blood vessels. d. cells. e. ground substance
Antidiuretic hormone (ADH) and aldosterone both help to control the composition of urine.
a. true b. false
What is the water potential of phloem relative to the water potential of the surrounding xylem?
a. lower b. higher c. about the same d. exactly the same