In vascular plants, sugar solutions and hormones are transported through tubes constructed of cells called
A) tracheids.
B) vessels elements.
C) plasmodesmata.
D) companion cells.
E) sieve-tube elements.
E
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Contrast in microscopy is most commonly achieved by:
a. changing objectives for various specimens. b. increasing the resolution or resolving power. c. staining techniques. d. adding a blue filter to the light path.
Which of the following is a consequence of human population growth?
a. reduction in life expectancy b. increased density-dependent growth factors c. degradation of the natural environment d. reduced urbanization
DNA replication occurs in the 5' to 3' direction; that is, new nucleoside triphosphates are added to the 3' end
Indicate whether the statement is true or false
New World monkeys evolved approximately 30 million years ago. These animals are easy to identify because they
A. have flattened noses and prehensile tails. B. have prehensile tails and hair. C. have opposable thumbs and protruding noses. D. have opposable thumbs and binocular vision. E. have protruding noses and prehensile tails.