The outcome of cleavage during embryonic development is the production of a
A. blastula.
B. gastrula.
C. neurula.
D. substantially larger embryo.
E. None of the choices are correct.
A. blastula.
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Which of the following statements is TRUE of restriction enzymes?
A. They are not naturally produced by bacteria, but are bioengineered by them. B. They protect bacterial cells from invasion by foreign DNA. C. There are less than 10 restriction enzymes known. D. They cleave the DNA backbone at only one location. E. They cleave DNA only at sites of adjacent thymine bases.
A(n) __________ property is a characteristic of a
system that does not appear in any of its component parts. a. efferent b. emergent c. elective d. energetic e. living
The villi are here
a. A b. B c. C d. D e. E
Water-soluble hormones
a. have to be transported by specific protein carrier molecules in the blood. b. have no trouble entering the target cells. c. find and react with the cell lipid bilayer. d. always elicit the production of a second messenger. e. are the same as lipid soluble.