Which phylum has a unique water vascular system that usually includes tube feet that can be used for movement?
a. Echinodermata
b. Hemichordata
c. Chordata
d. Cnidaria
Answer: a. Echinodermata
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Many genes are expressed when embryonic stem cells differentiate into muscle. This population of RNAs present in these cells would be called the ______________
Fill in the blanks with correct word
Which statement is true?
a. High concentrations of ATP inhibit the formation of more ATP. b. The ATP concentration in cells actually decreases at first when cells need large supplies of energy. c. The activity of many different enzymes influences the supply of ATP in cells. d. Cells constantly adjust their metabolic reactions to provide energy whenever it is needed. e. All of these are true.
When did Darwin's voyage take place?
a. between 1731 and 1736 b. between 1831 and 1836 c. between 1854 and 1859 d. between 1931 and 1939
Which choice is an example of "recombinant DNA"?
A) a bacterial plasmid combined with a human gene B) DNA that has been cut with a restriction enzyme C) DNA that has been amplified by PCR D) any DNA that has been removed from a cell