Which of the following products can be found in maternal milk?
a. Toxins
b. Antibodies
c. Alcohol
d. All of these choices
e. Drugs
d
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A cytologist is examining a tissue under an electron microscope. He notices that the endoplasmic reticulum of each cell is extremely rough in appearance and he knows that the rough appearance is because of the ribosomes embedded there. He asks why there are so many ribosomes. You respond,
A. "This tissue exports lipids and is very involved with mRNA production." B. "This tissue exports proteins to other areas of the body." C. "This tissue exports various nucleic acids, hence the large number of ribosomes present on the endoplasmic reticulum in each of those cells."
Which of the following is a disadvantage of self-fertilization?
a. Producing less fit offspring b. Restricting embryo nourishment c. Reducing the number of diploid females d. Creating less adaptable offspring
What molecule from coal-burning power plants dissolves in water vapor in the air and falls as acid
precipitation?
a. sulfuric acid b. ozone c. mercury d. sulfur dioxide e. carbonic acid
Which of the following are in order from primary producer to fourth trophic level?
a. grass ? coyote ? bird ?grasshopper b. coyote ? bird ? grasshopper ? grass c. bird ? grasshopper ? grass ? coyote d. grass ? grasshopper ? bird ? coyote e. grasshopper ? grass ? bird ? coyote