Amniocentesis is not performed on mothers over the age of thirty-five

a. True
b. False
Indicate whether the statement is true or false


False

Biology & Microbiology

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Restriction enzymes cut double-stranded DNA

a. between genes. b. at specific base sequences c. between bacterial and viral DNAs. d. between purines and pyrimidines. e. between promoter and operator DNA sequences.

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Shoots and roots consist of __________,

__________, and __________ tissue systems. Fill in the blank(s) with the appropriate word(s).

Biology & Microbiology

________ are tiny chambers within the lungs that allow for gas exchange

Fill in the blank(s) with correct word

Biology & Microbiology

Which of these molluscs commonly have a hinged shell?

A) gastropods only B) bivalves only C) cephalopods only D) gastropods and bivalves

Biology & Microbiology