There are how many different kinds of amino acids
in proteins?
a. 3
b. 6
c. 12
d. 20
e. 28
Answer: d
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Why is it necessary for many sperm to be present in order for one to fertilize the egg?
A) A mass of sperm is necessary to open the uterine tube. B) The combined enzymes digest a path through the corona radiata and zona pellucida. C) The combined motion of their flagella enables one sperm to push its way into the egg. D) A mass of sperm is necessary to gain entry into the ovary. E) A sperm cannot find the egg by itself.
You are examining a laboratory subject in which blood calcium levels are rising. Predict the consequences for this individual.
A. Blood vitamin D (1,25 dihydroxyvitamin D) would be stimulated. B. Blood parathyroid hormone levels would decrease. C. Blood parathyroid hormone levels would increase. D. Blood calcium levels are not under control by hormones. E. Vitamin D would be converted to vitamin E.
Answer the following statements true (T) or false (F)
1. Influenza is an example of a contagious disease. 2. Zoonotic diseases are diseases that humans acquire from zoo animals. 3. The largest waterborne outbreak ever to occur in the United States was caused by Giardia lamblia. 4. Water containing 1 coliform per 100 mL would be considered potable. 5. The most common zoonotic infection in the United States is Rocky Mountain spotted fever.
A pine tree is a(n) ____, and a pine cone is a(n) ____
a. angiosperm; a seed b. haploid plant body; dipold plant body c. sporophyte; a gametophyte d. gametophye; a sporophye e. egg; pollen grain