Why is perspiration an effective defense against microorganisms?
A) basic pH and low salt content
B) basic pH, low salt content, and presence of lysozyme
C) low salt content
D) presence of lysozyme
E) basic pH
Answer: D
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Imagine you are examining a small mammal that lives under desert conditions and is water deprived. You would predict that levels of the hormone ADH in its blood would be _____ and that its urine would be ______ than its blood.
A. high, more concentrated B. high, less concentrated C. low, more concentrated D. low, less concentrated E. high, no more concentrated
The spindle apparatus is made of
a. Golgi bodies. b. nucleoprotein. c. endoplasmic reticulum. d. microtubules. e. chromatids.
An autosomal recessive disorder
a. requires that only one parent be a carrier. b. displays its symptoms only in heterozygotes. c. is more frequent in males than females. d. will appear only in children of parents who both carry the gene. e. is dominant in females.
Which of the following antibiotics is/are produced by actinoplanetes?
A. Penicillin B. Nalidixic acid C. Gentamicin D. Cycloserine