What is the substance produced by bark that repels water?

a. pith
b. lignin
c. suberin
d. cortex


c. suberin

Biology & Microbiology

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Which of the following would you classify as something other than an animal?

A) sponges B) coral C) jellyfish D) choanoflagellates

Biology & Microbiology

Tumor suppressors are ________

a. mutant checkpoint genes b. checkpoint genes for proteins that stimulate mitosis c. mutant oncogenes d. checkpoint genes for proteins that inhibit mitosis

Biology & Microbiology

In cells that are constantly involved in secretion, an equivalent amount of membrane must be returned

to the interior of the cell for each vesicle that fuses with the plasma membrane; if this does not occur, then what would happen? a. The ratio of cell surface would decrease, compared to cell volume. b. The cell surface would shrivel. c. The surface area would remain constant. d. The number of membrane receptor proteins would decrease. e. The cell surface will keep expand

Biology & Microbiology

Which of the following provides insulation for the neuron?

a. synapse b. axon c. dendrite d. Schwann cell e. microglial cell

Biology & Microbiology