Which of the following is not a primate characteristic?
A) large litter size B) stereoscopic vision
C) rotating shoulders D) flattened nails instead of claws
Answer: A
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Cancer is usually due to:
A. exposure to chemicals or radiation. B. mutations in stem cells. C. a series of mutations that occur throughout an affected tissue or organ. D. a series of mutations that occur in a single lineage of somatic cells. E. a series of mutations that occur in multiple lineages of germ cells.
Answer the following statements true (T) or false (F)
1. In an autoclave, microorganisms are killed by ethylene oxide. 2. The goal of disinfection is to kill all microorganisms. 3. It is not possible to culture protozoa in the laboratory. 4. Rapid freezing, using liquid nitrogen, is an excellent method of killing microorganisms. 5. Microorganisms can be killed by direct exposure to ultraviolet light.
Some microbes secrete small molecules that induce other microbes to settle nearby. When a certain number of individuals have assembled, the chemical signal is strong enough to induce the aggregation to respond collectively to stimuli. This process is called
A. bioremediation B. mutualism C. conjugation D. quorum sensing E. mass-settling
Viruses are made of the same four types of biological molecules as living cells. These include all of the following except
a. lipids. b. capsids. c. carbohydrates. d. proteins. e. nucleic acids.