Genes are expressed at widely different levels in a given cell type. For the scarce mRNAs in cells, what fraction is produced in all cell types (say liver or kidney), and what is the name given to these genes?
What will be an ideal response?
Ans: About 90% of mRNAs are needed for viability of all cell types and the genes that encode them are called either "housekeeping" or "constitutive" because they are always expressed.
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DNA-binding proteins typically affect translation of a protein
Indicate whether the statement is true or false.
Each of the following is a voltage-gated Na+ channel property except
A) opens rapidly when stimulated. B) closes rapidly in absence of stimulus. C) opens to a variable extent depending on how much the stimulus voltage exceeds the threshold voltage. D) has a voltage sensor helix that controls channel gating. E) can be inactivated by the inactivating particle part of the channel protein.
Most cells that have become transformed into cancer cells have which of the following characteristics when compared to normal, healthy cells?
A. shorter cell cycle B. More carefully regulated rates of cell devision C. Lower rates of mitosis D. Higher rates of protein translation E. Identical DNA
A biofilm is an example of (antagonism/competition/cooperation) among microbes.
Fill in the blank(s) with the appropriate word(s).