Using polyethylene glycol, a cancer cell and a normal cell are fused. The resulting hybrid behaves like a normal cell. The best reason for this observation is the
A) recombination between cancer and normal chromosomes.
B) removal of environmental triggers.
C) presence of tumor suppressor genes and gene products.
D) exposure to polyethylene glycol.
E) both choices A and C
C) presence of tumor suppressor genes and gene products.
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In glycolysis, the product(s) of the enzyme aldolase is (are)
A) beta-hydroxy carbonate. B) dihydroxyacetone phosphate. C) glyceraldehyde-3-phosphate. D) choices A and B only E) choices B and C only
More stable than a hydrogen atom (atomic number 1)?
What will be an ideal response?
What is the effect of a nonsense mutation in a gene?
A. It introduces a premature stop codon into the mRNA. B. It alters the reading frame of the mRNA. C. It has no effect on the amino acid sequence of the encoded protein. D. It prevents introns from being excised. E. It changes an amino acid in the encoded protein.
Which of the following plant hormones prevents senescence and can initiate leaf growth?
Select one: a. indoleacetic acid b. gibberellin c. cytokinin d. abscisic acid e. ethylene