Which contraceptive method is the most effective form of birth control?
a. condoms
b. diaphragms
c. abstinence
d. oral contraceptives
e. vasectomy
ANSWER: c
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Which of the following is/are true of most of the extreme thermophilic Archaea in the phylum of Crenarchaeota?
A. They are sulfur dependent, they are acidophiles, and their cell walls contain lipoprotein and carbohydrate B. Their cell walls contain lipoprotein and carbohydrate C. Unlike most other Archaea, their membrane lipids are similar to those of the bacteria D. They are sulfur dependent E. They are acidophiles
Which substance requires sunlight for its synthesis?
A) cholesterol B) vitamin D C) vitamin K D) amino acids
Two types of polygamy are:
a. kin selection and reciprocal altruism. b. polygyny and polyandry. c. polygyny and monogamy. d. internal and external. e. isogamy and anisogamy.
The site of photosynthesis in a cell is the:
A) mitochondrion. B) central vacuole. C) chloroplast. D) stomata.