Prion diseases occur when _____
1.a mutation changes one amino acid in a protein, causing it to fold abnormally
2.abnormally folded proteins enter the body
3.bacterial infections trigger abnormal protein folding
4.1 and 2 only
5.1, 2 and 3
4
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Microsporidia were previously thought to be an early-branching taxon of Eukarya due to their parasitic lifestyle
However, new evidence suggests they have evolved into a parasitic lifestyle through adaptive gene loss which places them as close relatives of the zygospore-producing A) ascomycetes. B) chytridiomycetes. C) glomeromycetes. D) zygomycetes.
In a small population of cockroaches living in your kitchen, only a few roaches mate in one year. This can lead to random changes in allele frequency in the population through ______
A. nonrandom mating. B. selection. C. genetic drift. D. mutation. E. migration.
The homeostatic interaction between the endocrine system and which other system is demonstrated by
aldosterone regulating salt-water balance? a. digestive system b. circulatory system c. reproductive system d. urinary system e. skeletal system
In the lactose operon, the repressor binds to:
a. the lacI coding region. b. the promoter. c. the operator. d. the lacZ coding sequence. e. the lacY coding sequence.