Describe the miRNA-mediated pathway for degradation of eukaryotic mRNAs
What will be an ideal response?
Ans: Transcription generates a long precursor RNA that is cleaved into short (19 to 21 bp) guide miRNAs. These combine with a RISC protein complex and base-pair to target sequences in mRNAs, which can either repress translation or trigger degradation.
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The tissue found in the center of a eudicot root is
a. xylem. b. endodermis. c. cortex. d. phloem. e. pericycle.
Dominant phenotypes are more common than recessive phenotypes.
a. true b. false
What is meant by the term cotransformation?
A) An F? cell can become F+ several times in a life cycle. B) Cotransformation occurs when several linked genes are transformed simultaneously. C) Several pieces of DNA can form heteroduplexes in a cell. D) More than one phage infects a bacterial cell. E) A cell can pick up more than one F factor.
Antibodies are Y-shaped molecules that have two identical binding sites. Suppose that you have obtained an antibody that is specific for the extracellular domain of an RTK. When the antibody binds to the RTK, it brings together two RTK molecules
If cells containing the RTK were exposed to the antibody, would you expect the kinase to be activated, inactivated, or unaffected? Explain your reasoning.