Microtubules contribute to each of the following except
A) intracellular transport.
B) the human red blood cell disklike shape.
C) orientation of plant cellulose microfibrils.
D) filopodial structure.
E) mitotic spindles.
Answer: D
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Transcription factors generally "read" DNA sequences through amino acid–nucleotide contacts in the major groove because:
A. there are no minor groove hydrogen bond acceptors available at A–T base pairs. B. the minor groove displays only methyl functional groups for recognition. C. there are more hydrogen bond donors and acceptors in the major groove. D. all minor groove functional groups are the same.
Which of the following is the best explanation for the inability of a specific animal cell to reduce the Ca2+ concentration in its cytosol compared with the extracellular fluid?
A) blockage of the synaptic signal B) loss of transcription factors C) insufficient ATP levels in the cytosol D) low levels of protein kinase in the cell
The coiled DNA is found in
A. chromosomes. B. centromeres. C. nucleoli. D. lysosome.
Which of the following are NOT energy reserves?
A) carboxysomes B) polysaccharide granules C) lipid inclusions D) ribosomes E) metachromatic granules