The cells capable of releasing histamines are
a. mast cells and basophils.
b. basophils and eosinophils.
c. mast cells and eosinophils.
d. natural killer cells and macrophages.
e. all of these
A
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The relatively high percentage of individuals in West Africa who are heterozygous for the sickle cell trait is an example of _____
a. natural selection b. genetic drift c. spontaneous mutational spread d. heterozygote disadvantage e. the founder effect
________ needs to be approved before testing a new drug in humans
A) An NDA B) An IND C) An FDA D) A CDE E) An EPA
Imagine that the genetic code were read in a non-overlapping fashion, using four nucleotides to specify each amino acid (i.e., the sequence above would be read: AUGA-UGAU-GUAG)
Which of the following polypeptides would be obtained by translating the sequence above? Answer the questions below based on this RNA sequences: 5'-AUGAUGAUGAUG-3' This RNA transcript was generated using a synthetic DNA template. The letters B, D, E, F, G, and H have been selected to represent different amino acids. Assume that each codon is a different amino acid. A) B-B-B. B) B-D-B. C) B-D-E. D) D-D-D. E) None of these is correct.
The molecule needed to allow a cell to transfer genetic information from RNA to DNA is
A. DNA polymerase. B. RNA polymerase. C. reverse transcriptase. D. chlorophyll.