Spirilli are Gram-negative bacteria that possess internal flagella, which cause the entire cell to twist in a corkscrew
pattern.
Indicate whether the statement is true or false.
ANSWER: False - spirochetes
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Mutated versions of one or both of the genes BRCA1 and BRCA2 are associated with an increased risk of ________
a. breast cancer only b. lung cancer and pancreatic cancer c. both breast cancer and ovarian cancer d. lymphoma only
A neuron fires when Na+ ions
A. move down their concentration gradient by the process of facilitated diffusion. B. are actively pumped down their concentration gradient. C. move against their concentration gradient spontaneously. D. are actively pumped against their concentration gradient. E. are released from an internal store.
Divergence may lead to ____
a. genetic drift b. speciation c. balanced polymorphism d. gene flow e. genetic equilibrium
The misshapen version of a protein that causes properly folded proteins to misfold is the ________
A) virus B) prion C) viroid D) capsid