The xylem is made from ________
A) elongated living cells
B) dead, hollow cells
C) tubular living cells
D) intercellular spaces between cells
B
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The DNA polymerase involved in bacterial recombinational DNA repair is:
A. Pol III. B. Pol II. C. Pol I. D. Pol V. E. A DNA polymerase is not involved in bacterial recombinational DNA repair.
When blood glucose levels are low, the pancreas secretes ____
a. less glucagon and more insulin b. less insulin and more glucagon c. more glucagon and more insulin d. less glucagon and less insulin e. neither glucagon or insulin
The envelope of an animal virus is usually derived from the of its host cell.
A. cell wall B. plasma membrane C. capsule D. receptors
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. has different bases in its nucleotides.