The Casparian strip prevents water from diffusing through the ____
a. epidermis
b. vascular tissue
c. cortex
d. cytoplasm of endodermal cells
e. endodermal cell walls
ANSWER: e
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When did the Earth's crust form?
a. 2.9 billion years ago b. 3.2 billion years ago c. 4,600 million years ago d. 4.6 thousand years ago e. 12,000 years ago
The discovery of cells and the development of the cell theory would not have been possible without microscopes. Which two factors are important to all types of microscopes?
A) magnification and resolution B) magnification and color enhancement C) magnification and ability to observe live organisms D) magnification and three-dimensional imagery
Radioactive iodine is sometimes used to treat thyroid cancer. This is an example of the use of (isotopes/elements/ isomers) in medical treatment
What will be an ideal response?
In Southern blotting, DNA molecules are immobilized on
A) silicon chips. B) nitrocellulose membranes. C) agarose. D) gold beads. E) paper.