Which of the following form tubes and are alive when mature?

A) parenchyma cells
B) collenchyma cells
C) water-conducting cells
D) food-conducting cells


D

Biology & Microbiology

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If 20% of nucleotides in the DNA of a particular organism contain thymine, estimate the percentage of cytosine that is present in the DNA.  

A. 40% B. 80% C. 20% D. 15% E. 30%

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This tissue lines the heart

a. A b. B c. C d. D e. E

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Desulfovibrio bacteria can perform the following reaction: S6- S2-. These bacteria are

a. Synthesizing sulfur. b. Reducing sulfur. c. Hydrolyzing sulfur. d. Oxidizing sulfur.

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Jonas Salk developed a(n) (attenuated/inactivated/subunit) polio vaccine in 1955.

Fill in the blank(s) with the appropriate word(s).

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