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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A virus consisting of a single strand of RNA, which is transcribed into complementary DNA, is a _____
A) reverse transcriptase B) protease C) retrovirus D) RNA replicase virus E) nonenveloped virus
The vector Glossina palpalis group transmits the T. brucei gambiense organism. The diagnostic stage is the:
a. amastigote. b. epimastigote. c. trypomastigote. d. promastigote.
As early organisms evolved the ability to harness energy from the sun, other organisms began to die out because they were ____
a. destroyed by a meteorite b. outcompeted by multi-celled organisms c. consumed by dinosaurs d. poisoned by oxygen gas e. starved
If a student wants to accurately determine the size of bacterial cells in a culture, which of the following dyes would you recommend they use?
A) Methylene blue B) Crystal violet C) Safranin D) India ink