Wrinkling observed with aging is due to increased production of the extracellular matrix molecule, collagen.
Answer the following statement true (T) or false (F)
False
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The "pin" structure of a helicase:
A. serves as a spool for the DNA. B. holds the helicase dimers in the correct position. C. allows rewinding of the DNA after transcription. D. separates the complementary strands of DNA. E. prevents a translocation mechanism.
Which of the following chemical differences contribute to increased structural variety of RNA over DNA?
A. In addition to the double-stranded regions, virtually all of the unpaired bases are involved in base stacking interactions, increasing the variety and stability of RNA. B. Since RNA molecules have no pucker the sugar molecules are flat and can add to stacking stabilization. C. Base stacking contributes less to RNA stability because fewerbases are paired. D. Because ribose has one less hydroxyl group there are fewer opportunities for RNA to hydrogen bond. E. Different sugar puckers cause the phosphates in the RNA backbone to be farther apart.
Large-scale screening of blood for the hepatitis B virus uses an assay designed to detect
A. the Delta agent. B. viral surface antigens. C. alanine transaminase. D. the Dane particle.
Why are women given hormones prior to obtaining eggs for IVF?
a. to protect eggs from damage b. to protect the eggs from mutating c. to prevent premature maturation of the eggs d. to prepare the uterus for eggs e. to cause multiple eggs to mature at once