The cessation of regular menstrual cycles due to age is called ____
a. menopause
b. the luteal phase
c. the follicular phase
d. PMS
e. menstruation
ANSWER: a
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What is the substrate for beta-galactosidase in bacterial screening assays that check for colonies having
recombinant DNA?
a. lactose b. X-gal c. sucrose d. blue azure e. bromophenol blue
Which of the following is FALSE about
camptodactyly? a. Not all individuals who inherit the allele do express the allele. b. The condition affects the shape and mobility of fingers. c. Some individuals have abnormal fingers on only one hand. d. It is caused by a multiple allele system. e. Individual differences in the expression of this gene may stem from a variety of causes
Digestion of tissues in the stomach wall by gastric juice is usually prevented by
a. only the secretion bicarbonate. b. a covering of mucus, exclusively. c. intrinsic factor alone. d. secretion of bicarbonate and a covering of mucus. e. secretion of protein-digesting enzymes in inactive form and a covering of mucus plus intrinsic factor.
Radioactive iodine (131I) is commonly used in medical situations for diagnosing and treating thyroid conditions. The most common isotope of iodine that is not radioactive is 127I
Chemically, what is the difference between 127I and 131I? What do they have in common?