What is telomerase and what does it do?
What will be an ideal response?
Ans: Telomerase is a reverse transcriptase enzyme that is responsible for synthesizing telomeres. It contains a C-A rich RNA strand that extends the C-A rich DNA strand of the chromosomal end and acts as a template for extension of the telomeric G-T rich repeat.
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Data from both phylogenies and the fossil record show all of the following EXCEPT:
A. the earliest animals appeared more recently than the earliest land plants. B. microorganisms diverged early in evolutionary history. C. flowering plants diverged more recently than algae. D. primates diverged more recently than tetrapod vertebrates. E. diversity has accumulated over time.
In response to the presence of extracellular antigen, B cells rapidly proliferate and the immunoglobulin M (IgM) proteins produced are soluble rather than anchored in the membrane.This change in IgM protein state is due to:
A. the cleavage of several hydrophobic amino acid residues from the IgM protein. B. the differential expression of two different IgM genes. C. the predominant use of the first 3' end cleavage site of the IgM pre-mRNA. D. inclusion of the M exon in mature IgM mRNA.
Cerebrospinal fluid occupies the space between the:a
dura mater and skull. b. dura mater and pia mater. c. arachnoid and pia mater. d. pia mater and brain. e. dura mater and arachnoid.
If the ?G of a reaction was -31.45 kJoules, you would know that
A. the reaction is spontaneous. B. the reaction requires an energy input of 31.45 kJoules to proceed. C. the reaction most likely leads to development of a more ordered system. D. the products have more free energy than the reactants.