In which one of the following ways does a proto-oncogene differ from an oncogene?
A) Proto-oncogenes code for proteins that regulate the expression of structural genes; oncogenes code for nucleic acids involved in cell division.
B) Proto-oncogenes control normal cell division; oncogenes contribute to the development of cancer.
C) When oncogenes become damaged, they become proto-oncogenes.
D) Oncogenes activate tumor suppressor genes; proto-oncogenes repress tumor suppressor genes.
E) Proto-oncogenes cause cells to self-destruct when damaged; oncogenes cause damaged cells to repair themselves.
B
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If a plant with a genotype of Aa is self-crossed, how many combinations would produce homozygous recessive offspring?
a. Four b. One c. Two d. None
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What will be an ideal response?
Cells are constantly manipulating their DNA and histone proteins to regulate
A. gene expression. B. mutation formation. C. crossing-over. D. segregation.
Areas with a high population and low vaccination rates are susceptible to which type of transmission for yellow fever?
A) urban B) jungle C) intermediate D) jungle, intermediate, and urban E) jungle and intermediate