Down syndrome involves trisomy ____
a. 3
b. 5
c. 15
d. 19
e. 21
ANSWER: e
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Most carbohydrates manufactured in leaves and other photosynthetic parts are transported through the phloem to the rest of the plant by the process of
A. transpiration. B. translocation. C. osmosis. D. receptor-mediated transport. E. turgor pressure.
It’s your turn to clean out the refrigerator in the lab break room again, which is definitely your favorite way to spend a Friday afternoon. While you are contemplating moldy peaches, and your own disappointment at the lack of a limerick, you glance at the pantry door, from which has appeared a stream of ants carrying bits of cereal and crackers. You follow the ants out the door, down the hall, to a supply closet, where you find they’ve established a colony in a case of printer paper. If these were just any ants, you’d put in a ticket for an exterminator and go home, but alas!; they’re endangered Cube Farm Ants, which means the pantry and supply closet are now wildlife preserves. The thought of all the paperwork you’re going to have to fill out almost ruins your entire
weekend, until you realize you are standing in the middle of a fantastic pun – what is it? a. biodiversity hotspot b. closet species c. wildlife corridor d. ecological niche
Respond to statements 108–112 with reference to the five terms
listed below. a. zygote b. blastula c. cleavage d. gastrula e. somites M 108. This stage appears as a multicell, fluid-filled ball. E 109. This is the fertilized egg. D 110. This is the division of the zygote. D 111. Its cellular descendents give rise to all tissue and organs. D 112. This is a longitudinal series of paired segments.
In dosage compensation, females have the same amount of X-linked gene products as males. This is
brought about by A. the loss of one X chromosome from all somatic cells in females. B. the accelerated production by genes on the Y chromosome. C. the lowered rate of synthesis by genes on the X chromosome. D. the inactivation of one X chromosome in all somatic cells of females. E. none of these.