Which of the below is a hallmark of cancer?
a. generate their own mitogenic signals
b. resist exogenous growth-inhibitory signals
c. evade apoptosis
d. all the above are hallmarks of cancer
Ans: d. all the above are hallmarks of cancer
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A pollination syndrome is:
A. the synchronous release of pollen by many individuals of wind-pollinated trees B. specializations of plants that attract a specific kind of pollinator C. the simultaneous release of two sperm, one to affect fertilization and the other to initiate formation of endosperm D. a brushlike tongue of hummingbirds to which pollen adheres E. a series of bristles on the backs of insects to which pollen adheres
An average gram of forest soil contains about
A. 4 × 107 protists. B. 2 × 109 fungi. C. 4 × 107 bacteria and archaea. D. 2 × 109 bacteria and archaea.
Some plants are able to endure frequent flooding events because they form
A. adventitious roots that reach above the surface of the water. B. more xylem. C. an extra layer of spongy mesophyll. D. an extra porous epidermal tissue.
What is the difference between whole-chromosome aberrations and point mutations?
A) Point mutations affect a single base pair in the genome; aberrations affect a large section. B) Aberrations are not permanent changes in the DNA; point mutations are permanent. C) Point mutations are not permanent changes in the DNA; aberrations are permanent. D) Point mutations are the loss of parts of chromosomes; aberrations are the loss of whole chromosomes.