A characteristic of all cancers is that ____
a. the cells divide continuously
b. they have a benign form and a deadly form
c. several mutations in several different genes are required in order for cancer to develop
d. they are always due to a chromosome disjunction mutation
e. the rapid proliferation of cells is required
a
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Which of the following is LEAST likely required for the digestion of a meal?
A. molecules B. cells C. tissues D. organs E. populations
From the data, scientists conclude that plants survived heat best
A. when infected by the virus. B. with virus-free fungi. C. when not infected by the virus. D. with virus-infected fungi. E. without fungi.
A researcher decides to test the scientific validity of the common phrase “An apple a day keeps the doctor away.” What would be a valid hypothesis to investigate this specific question?
A. Eating apples decreases the frequency of contracting a cold. B. The daily consumption of a single apple does not change the number of visits to the doctor. C. Eating one apple every day is good for you. D. Apples are high in vitamin C. E. Those who consume apples have longer lifespans than those who do not consume apples.
DNA replication occurs during the __________ of the cell cycle
a. S phase b. G1 phase c. G2 phase d. interphase