When scientists are attempting to breed for increased ability of a plant to utilize carbon dioxide they must consider improvement of:
A. stomatal openings
B. bundle-sheath cells
C. mesophyll air spaces
D. chlorophyll production
E. stress tolerance
B. bundle-sheath cells
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The results of the treatment of 20 boys with SCID-X1 showed that ____
a. SCID-X1 can be cured through genetic engineering b. none of those treated were cured of the disease c. a bone marrow transplant can cure SCID-X1 d. our understanding of the human genome exceeds our ability to modify it e. the “treatment” caused numerous unforeseen complications.
During which stage do chromosomes line up in pairs on the equatorial plane?
A. metaphase I B. telophase I C. anaphase II D. metaphase II E. telophase II
During this stage of mitosis, the chromosomes become attached to the spindle at their kinetochores.
A. anaphase B. metaphase C. telophase D. prophase E. prometaphase
Which group of vertebrates possessed an anatomical feature that made evolution of the limbs of all tetrapods possible?
A) reptiles B) amphibians C) lobe-finned fish D) sharks