All of the following describe characteristics of sclerenchyma cells, except which?
A. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf.
B. They have thick, tough secondary walls.
C. Their secondary walls may be impregnated with lignin.
D. They form fibers and sclereids.
E. They lack living protoplasts when mature.
A. Their function is primarily to transport oxygen and carbon dioxide throughout the leaf.
You might also like to view...
Which is (are) the predominant second messenger(s)
involved in regulating glucose metabolism? a. insulin b. glucagon c. adenyl cyclase d. cAMP e. all of these
Which of the following is NOT a compound?
a. salt b. sugar c. carbon d. oxygen gas e. water
Puffballs and shelf fungi belong to the ________.
Fill in the blank(s) with the appropriate word(s).
Foreign substances like nicotine, morphine, and menthol exert their initial effects by _____
(a) killing cells immediately, exerting their physiological effects by causing cell death. (b) diffusing through cell plasma membranes and binding to transcription factors to change gene expression. (c) interacting with cell-surface receptors, causing the receptors to transduce signal inappropriately in the absence of the normal stimulus. (d) removing cell-surface receptors from the plasma membrane.