Successful mating can only occur between members of the same ____
a. population
b. order
c. species
d. kingdom
e. class
ANSWER: c
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Many eukaryotic operons are subject to numerous regulatory mechanisms
Indicate whether the statement is true or false.
During photosynthesis, carbon dioxide diffuses from the atmosphere into the leaves through pores called
A. plasmodesmata. B. stomata. C. companion cells. D. sieve tubes. E. guard cells.
The results of the treatment of 20 boys with
SCID-X1 showed that a. SCID-X1 can be cured through genetic engineering. b. most of the treated boys were cured of the disease. c. a transplanted normal IL2RG gene can cure SCID-X1. d. our understanding of the human genome lags behind our ability to modify it. e. all of these are true.
Which of the following are found in both DNA and RNA?
a. phosphate groups, guanine, and cytosine b. phosphate groups, guanine, and thymine c. deoxyribose, phosphate groups, and guanine d. ribose, phosphate groups, and adenine