Leaf chlorosis is not likely to be caused by a deficiency in ____
a. nitrogen
b. magnesium
c. iron
d. zinc
e. boron
ANSWER: e
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During which era did the dinoflagellates, coccolithophorids, and diatoms appear?
A. Paleozoic Era B. Mesozoic Era C. Cenozoic Era D. Neoproterozoic Era E. Paleoproterozoic Era
During animal development, a fertilized egg divides to form a ball of undifferentiated cells called a:
A. blastula. B. gastrula. C. meristem. D. zygote. E. neurula.
Embryonic stem cells derived from blastocysts are pluripotent, and therefore useful in stem cell research because they ________
a. are viable under a wide range of laboratory conditions b. do not replicate and are therefore stable long-term c. can form all cells, tissues, and organs of the human body d. are specialized and therefore arrested in G0 e. function to replace damaged or diseased body parts in adults
Red-green color blindness is an X-linked recessive trait in humans. A color-blind woman and a man with normal vision have a son. What is the probability that the son is color blind?
A) 75 percent B) 50 percent C) 25 percent D) 0 percent E) 100 percent