A root hair is an extension of an endodermal cell
____________________ Indicate whether the statement is true or false.
F, epidermal
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Why are fermentation reactions important for cells?
A) They produce alcohol, which enhances the permeability of their mitochondrial membranes to proton translocation. B) They regenerate NAD+ so that glycolysis can continue to operate. C) They allow the cell to conserve oxygen for the citric acid cycle. D) They generate oxygen.
The invariant amino acids in each peptide motif bound by MHC proteins are called
A) anchor residues. B) MHC peptides. C) antigen-binding immunoglobulins. D) TCR peptides.
Telomeres are found ____
a. in the middle of chromosomes b. at replication origins c. where DNA strands are joined together d. within genes e. at the ends of chromosomes
About ________ percent of human genes are alternately spliced.
A) 10 B) 40 C) 75 D) 90