The internal urinary sphincter is made of __________ muscle and under __________ control.
A. skeletal, voluntary
B. skeletal, involuntary
C. smooth, voluntary
D. smooth, involuntary
Ans: D. smooth, involuntary
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Which of the following is most critical for the association between histones and DNA?
A) Histones are small proteins. B) Histones are highly conserved (that is, histones are very similar in every eukaryote). C) Histones are synthesized in the cytoplasm. D) There are at least five different histone proteins in every eukaryote. E) Histones are positively charged.
Which of the following is the fourth basic step to genetically modify a cell?
A) transformation B) ligation C) plasmid cleavage D) isolation of gene E) restriction-enzyme digestion of gene
Growth of long bones
a. follows the cartilage model. b. occurs in the middle at first, then at both ends. c. is characterized by bone tissue replacing calcified cartilage. d. is characterized by the persistence of cartilage at both ends of the bone. e. includes all of these.
What is a scientific theory?
A) an explanation supported by large amounts of experimental evidence B) an explanation that cannot be modified with new experimental evidence C) little more than one person's educated guess D) any testable explanation for a question or problem