Why is cancer more prevalent in older individuals?
a. Cancer cells form at a faster rate.
b. More mutations develop with age.
c. The protective action of cytotoxic T cells breaks down with age.
d. Cancers learn to disguise themselves as "self" with time.
e. Older people tend to be exposed to more dangerous chemicals.
ANSWER: c
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Consider a deep sea hydrothermal vent. Which of the following statements is incorrect?
A. The associated chemolithotrophs are primary producers. B. The vent is a habitat. C. Its biome is the deep marine biopshere. D. The vent hosts communities of chemolithotrophic bacteria.
In most marine ecosystems, autochthonous inputs of organic carbon are greater than allochthonous inputs of carbon
Indicate whether the statement is true or false
Continuous inheritance is often related to the term quantitative inheritance. Why?
What will be an ideal response?
During which of the following stages of the cell cycle does DNA replication take place?
A. prophase B. interphase C. telophase D. anaphase