Which of the following statements regarding xylem vessels in angiosperm trees is not true?
A. Vessels allow angiosperms to have higher
rates of water flow through stems.
B. Angiosperms are able to fix more CO2 and
have higher growth rates due to vessels.
C. Vessels are rigid and strong and do not
require additional support cells.
D. Angiosperm wood structure has a high
degree of diversity due to the presence of
several distinct cell types.
E. Angiosperms primarily use vessels to
transport water and minerals.
C
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A. 1 B. 3 C. 4 D. 6 E. 9
Which type of animal depends on the environment for body heat?
a. endotherm b. mesoderm c. ectotherm d. anterotheil
____________________ T cells secrete interleukins that activate other cells in both the cell-mediated
and antibody-mediated immune responses. Fill in the blank(s) with the appropriate word(s).
Embryonic stem cells are different from primary cell cultures or permanent cell lines derived from a tissue in that they are capable of
a. generating many cell types. b. growing and dividing. c. synthesizing their own DNA. d. transporting nutrients across their plasma membrane.