Your friend is getting ready to take a vacation to Africa, where malaria is common. You tell her to keep a can of bug spray and her mosquito net on hand. She doesn’t understand and asks why mosquito netting is important. You tell her that:
1.Mosquitoes will cause a nasty rash, and she should avoid being bitten at all costs.
2.Mosquitoes are a vector for the organism that causes malaria, so she should avoid being bitten.
3.Mosquitoes have a venom that can cause allergic reactions, so she should try to avoid getting bitten.
4.Mosquitoes bite and cause severe pain, so she should avoid being bitten if possible.
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Which of the following enzymes would you find in a cow's gut, but not in yours?
A. cellulase B. pepsin C. collagenase D. carboxypeptidase E. acetylcholinesterase
Crossing over occurs during
a. anaphase I. b. metaphase II. c. prophase I. d. prophase II. e. telophase II.
Each version of a gene is called a(n)
a. allele. b. chromosome. c. histone. d. centromere. e. artifact.
What is the smallest number of nucleotides that must be added or subtracted to change the triplet grouping of the genetic message?
A) one B) two C) three D) four