Which feature is true for RNA polymerase activity but NOT true for DNA polymerase activity?
a. Precursor nucleotides can contain adenine, guanine, or cytosine.
b. Growth of nucleotide sequence is only in the 5??3? direction.
c. Newly synthesized strands are antiparallel to its template strand.
d. Nucleotide primer is unnecessary.
Answer: D
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The deep-sea vent hypothesis for the formation of prebiotic organic molecules is based on
A. temperature gradients of the hot water coming from the vents and cold ocean water. B. hot gaseous substances released from the vents. C. a buildup of radioactive substances around the vents. D. temperature gradients of the hot water coming from the vents and cold ocean water and hot gaseous substances released from the vents are correct answers. E. temperature gradients, proton gradients, and radioactive substances could all lead to the formation of prebiotic organic molecules.
Water is unique because its solid phase is ____ the liquid phase
a. denser than b. similar to c. less dense than
Which of the following statements is true regarding
HPV infection? a. It afflicts at least 20 million Americans. b. Some strains cause genital warts. c. Two strains cause cervical cancer. d. A vaccine can prevent HPV infection. e. All of these are true.
When certain hormones are added to the uterus, they induce thickening in the cells lining its walls. Which of the following hormones is likely to be responsible for this change?
a. estrodiol b. testosterone c. progesterone d. follicle-stimulating hormone