A purine or pyrimidine that differs in chemical structure from those normally found in DNA or RNA is called a(n)
____________________. Fill in the blank(s) with the appropriate word(s).
base analog
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What are some of the ways flowers attract pollinators?
What will be an ideal response?
Certain parasites, such as intestinal tapeworms, cannot survive outside of the host. Why are they still considered alive?
A) Survival outside of a host is not a requirement for life. B) They are still considered alive because they are studied by biologists, and biology is the study of life. C) As long as they are made of cells, they are considered to be alive. D) Because they cannot survive outside of the host, parasites are not considered alive.
Which one of the following parts of the eye is affected by cataracts?
A) cornea B) lens C) aqueous humor D) vitreous humor E) retina
The _________ are the organizing centers for microtubules involved in separating chromosomes during mitosis.
Fill in the blank(s) with the appropriate word(s).