Which of the following is NOT true about the
movement of water through a plant?
a. it occurs through columns of dead cells
b. the water is pulled through the plant
c. the process is called translocation
d. it is a passive process
e. all of these are true about the movement of
water through a plant
C
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Which of the following is(are) an important
influence(s) on the evolution of mammals? a. continental movement b. geographic isolation c. competition between species d. decline of the dinosaurs e. all of these
Air and water vapor cross the epidermis via
a. pits. b. perforations. c. osmosis. d. stomata. e. tracheids.
Oocytes store mRNAs with _______ and activate them by _______.
a. no cap; addition of a cap b. long poly-A tails; shortening the tails c. short poly-A tails; lengthening the tails d. bound siRNA; removing the siRNA
You compare homologous nucleotide sequences among several pairs of species with known divergence times. A pair of species that diverged 1 million years ago has two nucleotide differences, a pair that diverged 2 million years ago has four nucleotide
differences, and a pair that diverged 3 million years ago has six nucleotide differences. You have sequence data for another pair of species for which the divergence time is unknown. There are five nucleotide differences between them. Based on your clock, when did their line of ancestry diverge? A) 3.5 million years ago B) 3 million years ago C) 2.5 million years ago D) 2 million years ago