In which structure do cilia covered in mucus trap foreign particles?
a. urinary tract
b. reproductive tract
c. arteries
d. respiratory tract
e. digestive tract
ANSWER: d
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Which of the following does NOT have an effect on the amount of muscle tension that results from a muscle contraction?
a. the size of the motor units in the muscle b. how frequently the motor units are stimulated c. the type of bone to which the muscle is attached d. the number of motor units active at one time
Viruses use the host's machinery to make copies of themselves. However, some human viruses require a type of replication that humans do not normally have. For example, humans normally do not have the ability to convert RNA into DNA
How can these types of viruses infect humans, when human cells cannot perform a particular role that the virus requires? A) The virus causes mutations in the human cells, resulting in the formation of new enzymes that are capable of performing these roles. B) The viral genome codes for specialized enzymes not in the host. C) The virus infects only those cells and species that can perform all the replication roles necessary. D) Viruses can stay in a quiescent state until the host cell evolves this ability.
The major carrier of chemical energy in all cells is:
A) acetyl triphosphate. B) adenosine monophosphate. C) adenosine triphosphate. D) cytosine tetraphosphate. E) uridine diphosphate
Place the processes occurring in the digestive tract in the correct order.IPeristaltic waves of contraction propel the food along the esophagus.IIGastric juices are secreted with the arrival of food into the duodenum.IIIThe acidic chyme is transferred through the pyloric sphincter.IVHCl and pepsin begin digestion of proteins into shorter polypeptides.
A. I, IV, and III B. II, III, and IV C. I, II, and III D. I, II, and IV E. IV, III, and II