Which of the following can cross a biological membrane by simple diffusion?
a. Glucose
b. Fatty acid
c. Amino acid
d. Protein
Ans: b. Fatty acid
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Phagocytes were first discovered and named by
A. Pasteur. B. Koch. C. Lister. D. Metchnikoff.
The development of a body plan with differentiated cells is achieved by ________
a. repression of mRNA translation b. expression of different genes in different embryonic cells c. absorption of specific proteins and enzymes d. suppression of proteolytic enzymes
During a sequencing reaction, the researcher adds all the required components to the reaction, but
accidentally adds only one of the four dideoxynucleotides, the ddC. What kinds of products will be observed after this reaction is complete?
a. All fragments will end in A. b. All fragments will end in C. c. All fragments will end in G. d. All fragments will end in T. e. No fragments will be made.
All of the following are types of light microscopes EXCEPT
A) fluorescent. B) confocal. C) phase-contrast. D) scanning tunneling. E) bright-field.