Mature vessel elements:a
form sieve tubes in the vascular tissue.
b. have pits in their side walls, which allow water to be transported laterally.
c. are alive and contain cytoplasm.
d. are given support by companion cells.
e. occur in pairs, forming stomata in the epidermis
b
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What will be an ideal response?
DNA’s two major functions are to ____________________ and to carry the ____________________ information for
proteins and RNA molecules Fill in the blank(s) with the appropriate word(s).
The part of the brain that regulates the internal environment of the body by linking the endocrine and nervous systems is the
A. thalamus. B. pineal gland. C. hypothalamus. D. amygdala.
A reproductive difference between sea urchins and humans is _____
A) the sea urchin egg completes meiosis prior to fertilization, but meiosis in humans is completed after fertilization B) sea urchin eggs and sperm are of equal size, but human eggs are much bigger than human sperm C) sea urchins, but not humans, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs D) sea urchin zygotes get their mitochondria from the sperm, but human zygotes get their mitochondria from the egg