Cell shapes are largely determined by:
A. cytoskeletal protein networks in the
cytoplasm.
B. adhesion proteins that assemble at cell
surfaces.
C. a mesh of proteins and polysaccharides in
the extracellular matrix.
D. cytosolic proteins that assemble into
structures called cellular junctions.
E. All of these choices are correct.
E
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A small amount of skin is healthy because it
stimulates the production of vitamin___.
a. C b. D c. K d. B12 e. E
The average number of female offspring born to a female over her lifetime is referred to as the
A) crude birthrate. B) age-specific birthrate. C) gross reproductive rate. D) net reproductive rate.
Which part of the seed produces hydrolytic enzymes that break down the starchy endosperm during seed germination?
A. plumule B. aleurone layer C. coleorhiza D. scutellum E. amyloplasts
Which of the following is the best description of a gene?
A) a protein whose amino acid sequence is encoded in a segment of DNA B) A section of the nucleus where transcription takes place. C) a segment of mRNA that is translated into a protein D) a collection of millions or billions of base pairs of DNA, encoding many proteins E) a segment of DNA that is transcribed into an mRNA, a tRNA, or an rRNA