Sieve-tube elements are food-conducting plant cells that are part of the

A) xylem.
B) tracheids.
C) phloem.
D) sclereids.


Answer: C

Biology & Microbiology

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Which structure of the brain contains the cerebral spinal fluid?

a. ventricles b. thalamus c. medulla d. meninges e. reflexes

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The taxonomic grouping that would represent the next highest (more inclusive) level above that

represented in Figure 23-1 is: a. Family. b. Order. c. Class. d. Phylum. e. Kingdom.

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Suppose you've assumed the following two data-generating processes: (1) Yi = f (Hi, Ji) and (2) Ji = g (Xi, Zi). What do these assumptions imply?

A. X has an indirect causal effect on J. B. J has a direct causal effect on H. C. Z has an indirect causal effect on Y. D. Z has a direct causal effect on Y.

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The head of a sperm is capped with an organelle that contains glycoprotein-digesting enzymes. What is this organelle called?  

A.  zona pellucida B.  acrosome C.  granulosa D.  blastula E.  neural cap

Biology & Microbiology