The chance that an individual in the United States will experience some form of cancer in his or her lifetime is
A) 1 in 3.
B) 1 in 10.
C) 1 in 25.
D) 1 in 1,000.
E) 1 in 10,000.
A
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A researcher has a petri dish containing several species of bacteria, but no viruses. She notices that the population of E. coli in her petri dish has no antibiotic resistance
Two weeks later, she reassesses the bacteria and finds that the E. coli have acquired antibiotic resistance. How could this have happened? A. E. coli acquired the genes conveying antibiotic by conjugation with other bacterial cells. B. E. coli acquired the genes conveying antibiotic by transformation. C. Spontaneous mutations conveying antibiotic-resistance arose in the E. coli population of the petri dish. D. All of these answer options are correct.
Which situation does not reflect the original diploid parental chromosome number?
1.cell division via mitosis 2.cell division via meiosis 3.fertilization of haploid gametes 4.cells at the end of telophase in mitosis
Active chemicals found in chocolate, tea, coffee, and
soft drinks are examples of which of the following? a. depressants b. stimulants c. analgesics d. hallucinogens e. antipsychotics
A karyotype:
A) shows chromosomes as they appear before replication. B) can show the number of chromosomes in a cell. C) can reveal the location of a gene. D) can reveal the presence of cancerous genes.