Match the following items with the correct statements.

_______1. Organisms that live on dead or decaying organic matter.
_______2. Microorganisms that do not cause disease.
_______3. Microorganisms that usually do not cause disease, but can cause disease under certain circumstances.
_______4. The microorganisms that live on us and in us.
_______5. The most common causes of infectious diseases or microbial intoxications.

a. pathogens
b. nonpathogens
c. opportunistic pathogens
d. indigenous microflora
e. saprophytes


1. e. saprophytes
2. b. nonpathogens
3. c. opportunistic pathogens
4. d. indigenous microflora
5. a. pathogens

Biology & Microbiology

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The basic tool of genetic regulation is the ability of certain proteins to bind to specific  

A.  regulatory RNA sequences. B.  regulatory DNA sequences. C.  repressor parts of the gene. D.  promoter parts of the gene. E.  enzymes of the cell.

Biology & Microbiology

Research on transgenic Drosophila models of Huntington disease has found that ____

a. the NUB1 protein decreases levels of mutant huntingtin protein, and thereby, cell death b. the mutant huntingtin protein is destroyed by the SOD1 protein c. Drosophila and humans share more than 90% of genes d. the accumulation of mutant proteins in the brain causes Huntington disease e. treatment of patients with Rhes protein cures Huntington disease

Biology & Microbiology

Oceanic surface currents are driven by winds

Indicate whether the statement is true or false

Biology & Microbiology

Natural selection operates to produce changes in

a. individuals. b. populations. c. kingdoms. d. phyla. e. animals only.

Biology & Microbiology