Which of the following is true with regard to DNA primase?
A. It synthesizes the RNA primers required for lagging strand synthesis.
B. It requires the presence of a 3'-OH in order to synthesize DNA.
C. It is responsible for RNA primer removal and replacement with DNA.
D. It seals the gaps or nicks produced during lagging strand synthesis.
E. It is inhibited by the presence of the helicase.
A
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Methylation regulates transcription by ____
a. adding a methyl group to cytosine bases of DNA b. adding a methyl group to cysteine residues on RNA polymerase II c. adding a methyl group to cysteine bases of DNA d. adding a methyl group to cytosine residues on RNA polymerase II e. interfering with the chromatin remodeling process
Which of the following is used by earthworms and some amphibians for respiration?
a. gills b. pulmonary ventilation c. skin d. diffusion
Four of the five statements listed below are
related to the second law of thermodynamics. Select the EXCEPTION.
a. There is an increased state of disorder. b. Energy can be neither created nor destroyed. c. The amount of available energy in a closed system declines with time. d. Energy is lost as it is transferred or transformed to another form. e. Spontaneous flow of energy from high- to low-quantity forms occurs
Acid-fast cells such as Mycobacterium lose the color of the primary stain in the presence of hydrochloric acid
Indicate whether the statement is true or false