The pattern of distribution for a certain species of kelp is clumped. The pattern of distribution for a population of snails that live on the kelp would be
A) clumped.
B) random.
C) uniform.
Answer: A
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The following are processes that occur in the production of human insulin via genetic
engineering:i. The insulin gene is inserted into a bacterium plasmid. ii. Bacteria with the modified plasmid reproduce. iii. The insulin gene is isolated from insulin-producing cells in the human pancreas. Which of the following lists these steps in the correct order of occurrence?
a. i, ii, iii b. ii, iii, i c. ii, i, iii d. iii, i, ii
Why do we have fossils for only about 250,000 different species, although there must have been millions more species?
1.Fossils can form only if exposed to air, and most fossils are buried.
2.Fossils formed only where there were major disruptive geologic events, so they are relatively rare.
3.Fossils are found close to the surface so many have been destroyed by development.
4.Many ancient and extinct species were very soft, so did not fossilize well.
Phosphofructokinase is stimulated by high levels of ATP
__________________ Indicate whether the statement is true or false.
Viruses which infect many different tissues types are said to have a(n)
A) broad tropism. B) narrow host range. C) narrow tropism. D) broad host range. E) indeterminate host range.