A bacterial chromosome consists of:
a. a linear DNA molecule many times larger than the cell.
b. a circular DNA molecule many times larger than the cell.
c. a circular DNA molecule smaller than the cell.
d. a linear DNA molecule smaller than the cell.
e. a linear or circular DNA molecule smaller than the cell.
B
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The enzyme responsible for proofreading a growing DNA strand and for replacing mismatched nucleotides is
A. DNA polymerase. B. helicase. C. topoisomerase II. D. DNA ligase. E. DNA replicase.
Nicotine can be found in nectaries. Indicate whether the statement is true or false
Embryonic endoderm gives rise to:
a. muscle. b. the lining of the digestive tract. c. the nervous system. d. skin. e. skeletal tissue
Which physician realized that doctors were causing maternal deaths by failing to wash their hands while assisting during childbirth?
A) Girolamo Fracastoro B) Joseph Lister C) Louis Pasteur D) Ignaz Semmelweis