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

Biology & Microbiology

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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.

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In most marine ecosystems, autochthonous inputs of organic carbon are greater than allochthonous inputs of carbon

Indicate whether the statement is true or false

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Continuous inheritance is often related to the term quantitative inheritance. Why?

What will be an ideal response?

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During which of the following stages of the cell cycle does DNA replication take place? 

A. prophase B. interphase C. telophase D. anaphase

Biology & Microbiology