How many hydrogen bonds are formed between adenine and thymine?
a. 1
b. 2
c. 3
d. 4
e. 6
ANSWER: b
Biology & Microbiology
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Archaea is divided into three phyla
Indicate whether the statement is true or false.
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Virus size is
a. 300 to 400 ?m. b. 10 to 400 mm. c. 10 to 200 cm. d. 10 to 400 nm. e. 300 to 400 mm.
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Transfer RNA differs from other types of RNA
because it a. transfers genetic instructions from cell nucleus to cytoplasm. b. specifies the amino acid sequence of a particular protein. c. carries an amino acid at one end. d. contains codons. e. does none of these.
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Which of these characteristics is NOT found in the amphibians but is developed in reptiles?
Select one: a. thin, moist skin b. internal fertilization c. small, inefficient lungs d. aquatic larvae e. eggs with gelatinous covering
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