The Cohesion-Tension Theory explains the role of ________ in long-distance water transport.
A. membranes
B. transpiration
C. sap movement
D. plasmodesmata
E. surface tension
B. transpiration
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How many membranes make up a chloroplast?
A. 1 B. 2 C. 3 D. 5
Blood returning to the heart enters:
a. a ventricle b. the aorta c. an atrium d. a capillary bed e. all of these
What is a reason that aneuploidy in sex chromosomes is generally better tolerated than aneuploidy in autosomal chromosomes in humans?
A) In somatic cells, most of the genes on only one X chromosome are transcriptionally active. B) Autosomal aneuploidy leads to heart defects and death in utero. C) Y chromosome duplication results in only minor changes in testosterone levels. D) Sex chromosome aneuploids may occur as the result of fertilization, but extra sex chromosomes are removed from the developing embryo during subsequent mitosis. E) Any change in autosome number results in increased susceptibility to infection.
A linear DNA fragment is cut with a restriction enzyme to yield two fragments. How many restriction sites are there for the enzyme in this fragment?
A. one B. two C. three D. four E. It cannot be determined with this information.