Under normal circumstances, the microbiota of the skin is kept in check by
A. a pH above 8.
B. excessive moisture.
C. phagocytic activity.
D. a slightly acidic pH.
Answer: D
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The hearts of a fetal pig and a human are similar in that they are
(a) the primary pump of the circulatory system of the body. (b) both four chambered. (c) composed of cardiac muscle tissue. (d) all of the above.
Dissolved oxygen content in stream water is affected by
(a) organic matter in the water. (b) overgrowth of algae. (c) water nutrient levels. (d) all of the above.
How can microarrays differentiate between a wild-type allele and a disease allele that differ at only one nucleotide?
A) The DNA sequences of both alleles are determined. B) Oligonucleotides hybridize with the two alleles differently. C) Polymerase chain reaction primers amplify DNA from one allele, but not the other. D) Microarrays are not capable of detecting a difference between those alleles.
Which of the following tissue types are found only in the zone of cell division of the root tip?
A. ground meristem B. endodermis C. xylem & phloem D. None of these are restricted to just the zone of cell division of the root tip. E. All of these are restricted to the zone of cell division of the root tip.