The lateral movement of transmembrane proteins can be restricted by several different mechanisms. Which mechanism best describes the process by which neutrophils are recruited by endothelial cells?
(a) proteins are tethered to the cell cortex
(b) proteins are tethered to the extracellular matrix
(c) proteins are tethered to the proteins on the surface of another cell
(d) protein movement is limited by the presence of a diffusion barrier
(c)
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The most distinctive characteristic of leaf mesophyll cells is that they are filled with
A. central vacuoles. B. many chloroplasts. C. oxygen bubbles. D. veins. E. stomata.
Precipitation is generally most acidic in which region of the United States?
a. Southeast b. Southwest c. Northwest d. Northeast e. Midwest
Ricin is toxic because it
a. binds to eukaryotic DNA. b. binds to eukaryotic mRNA. c. blocks food from entering the cell. d. inactivates ribosomes. e. binds to nerve tissue and causes paralysis.
Which variable is likely to undergo the largest change in value resulting from a mutation that introduces a new allele into a population at a locus for which all individuals formerly had been fully homozygous?
A) average heterozygosity B) nucleotide variability C) geographic variability D) average number of loci