What is the main role of human chorionic gonadotropin?
A. It stimulates the release of oxytocin from the mother's pituitary.
B. It allows the mother to realize she is pregnant, via pregnancy tests.
C. It is similar to FSH in stimulating follicle development.
D. It maintains the corpus luteum.
D. It maintains the corpus luteum.
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Which of the following is false about rifamycins?
A) They were originally isolated from bacteria. B) They are broad-spectrum antimicrobials that are effective against most Gram-positive bacteria and some Gram-negative bacteria too. C) They inhibit transcription by binding to RNA polymerase. D) Because the chemical structure is such a good fit with RNA polymerase, it is unlikely to cause interactions with any other medications currently known. E) The drugs are useful to combat mycobacterial species that can be especially tough to treat due to the challenges of getting drugs across their waxy mycolic acid-enriched cell wall.
________ used X-ray diffraction to deduce the helical shape of DNA.
A) Linus Pauling B) James Watson and Francis Crick C) Martha Chase D) Rosalind Franklin
Traditionally, chymotrypsin used in the food
industry was obtained from
a. mold fermentation. b. yeast fermentation. c. sheep stomachs. d. bacterial fermentation. e. calf stomachs
Which of the following types of organisms are commonly single-celled (unicellular)?
a. bacteria, some fungi (yeast), and many protozoans b. many fungi, some protozoans, and plants c. plants and animals d. many fungi, plants, and animals