Which metabolic waste product is so toxic it must be converted into other forms before the kidney can excrete it?
a. urea
b. carbon dioxide
c. ammonia
d. oxygen
e. electrolytes
ANSWER: c
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Imagine that a section of heart muscle no longer has gap junctions. What do you think would be the result?
A. The effects would be minimal from this change. B. The ability of the heart muscle cells to contract would be severely compromised. C. The ability of the heart muscle cells to reproduce would be severely compromised. D. The ability of the heart muscle cells to coordinate their contractions would be severely compromised.
Which of the following statements is true of linkage?
A) The closer two genes are on a chromosome, the lower the probability that a crossover will occur between them. B) The observed frequency of recombination of two genes that are far apart from each other has a maximum value of 100%. C) All of the traits that Mendel studied—seed color, pod shape, flower color, and others—are due to genes linked on the same chromosome. D) Linked genes are found on different chromosomes.
Persons with asymptomatic infections may be (contaminants/reservoirs/zoonoses) of disease.
Fill in the blank(s) with the appropriate word(s).
Food macromolecules are absorbed intact from the digestive tract and they are broken down only by the cells that ultimately use them.
Indicate whether the statement is true or false.