Coliforms in a water sample indicate ________ contamination
A) fecal
B) industrial or chemical
C) arthropod
D) All of the answers are correct.
Answer: A
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The production of gene families, such as the globin genes is the result of ________
A. inversions B. deficiencies C. gene duplications D. simple translocations E. None of the answers are correct
Rods and cones are located in the:
a. lens b. cornea c. pupil d. iris e. retina
Your friend read an article on the internet today about a new single-celled organism that has been discovered by scientists in Africa. She said the organism is the size of a mouse, and lives in freshwater streams. You tell her to check the source because you think she has read a hoax. How do you know?
1.Because an organism of that size would have been discovered years before now. 2.Single-celled organisms can’t survive in fresh water. 3.A single-celled organism could not attain that size. They are limited by surface-to-volume ratio. 4.There would have to be many more than one, since cells must come from other cells. If they only collected one, it must be a hoax.
Which of these leukocytes are the most abundant and begin to phagocytize pathogens to reduce the spread of infection?
A) basophils B) eosinophils C) neutrophils D) monocytes