When DDT was first introduced, insects were very susceptible to it. The development of resistance to
DDT by insects was the result of
a. special creation.
b. natural selection of forms that expressed genes for resistance.
c. the high biotic potential of insects.
d. a naturally occurring example of inheritance of acquired characteristics.
e. mutation induced by DDT.
B
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Cyclins modulate the progression of cells through the cell cycle by
A) directly activating G proteins. B) inducing synthesis of constitutively active forms of growth cell receptors. C) activating protein kinases that are critical regulators of cell division. D) degrading histones. E) increasing the production of DNA polymerases.
How can organisms with the same phenotype have different genotypes and vice versa, and what is the
significance?
What will be an ideal response?An example of a primary consumer is a(n) ____
a. tiger b. grasshopper
c. eagle d. hyena e. snake
When did the first eukaryotic cell form?
A) 2.1 thousand years ago B) 2.1 million years ago C) 2.1 billion years ago D) 3.7 billion years ago