What happens when DNA polymerase replicating DNA encounters RNA polymerase transcribing DNA in the same direction?
What will be an ideal response?
Ans: DNA polymerase is able to move 10× faster than RNA polymerase, so DNA polymerase normally overtakes RNA polymerase. It appears that DNA polymerase bypassing RNA polymerase without disrupting transcription, but the mechanism is unknown.
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DNA ligase closes nicks between ____ by forming ____ bonds
a. nitrogenous bases; hydrogen b. RNA fragments; noncovalent c. DNA and RNA fragments; covalent d. DNA fragments; peptide e. DNA fragments; covalent
Small plants and animals rely on __________ of
material through their body. Fill in the blank(s) with the appropriate word(s).
Leukocyte movement from blood to the site of tissue damage or infection involves ________, leukocyte movement toward the blood vessel wall; ________, the movement of leukocytes between endothelial cells of the blood vessel; and ________, the movement within the tissue to the site of injury.
A) margination : diapedesis : chemotaxis B) diapedesis : margination : chemotaxis C) chemotaxis : diapedesis : margination D) margination : chemotaxis : diapedesis E) chemotaxis : margination : diapedesis
Which of the stages or structures in Figure 51-1 was formed by the process of gastrulation?
a. 1 b. f c. g d. 3 e. 5