A. pumps B. Membranes do not allow water into or out of cells. C. diffusion D. p

Question

A. pumps

B. Membranes do not allow water into or out of cells.

C. diffusion

D. pinocytosis

E. aquaporins

A. the facultative anaerobe Bacillus cereus

B. the Gram-negative plague-causing bacteria Yersinia pestis

C. the hyperthermophile bacteria Methanopyrus kandleri

D. the barotolerant bacterial strain DSK1

Of the reactions that involve reactive oxygen species as shown in the figure below, the one marked  

A. altered proteins to allow them to function better in that environment

B. altered membrane permeability to remove toxins

C. altered DNA flexibility to allow more genes to be expressed

D. altered peptidoglycan thickness to prevent molecules from getting into the cell

A. changing the fatty acid interactions in membranes, thus harming the integrity of the hydrophobic barrier

B. causing carbohydrate changes so that they would no longer serve as proper nutrient sources

C. changing nucleic acids to nucleic bases and interfering with the DNA code

D. disrupting protein secondary structure, thus decreasing enzyme activity

Why wouldn't the majority of microbial species inhabiting the human intestine be pathogenic?
Choose one:

A. There really aren't that many human pathogens, so it would not be possible to have that many out of the 500 different species that are normally present.

B. If there were a lot of pathogens, they would constantly be battling for domination over the intestine, so the end result would be the most powerful pathogen, thus greatly reducing the number of species present.

C. Having a lot of pathogens inhabiting a normal intestine would mean that the individual would constantly be sick and thus at a disadvantage for survival.

D. Since the pathogens use the probiotic microbes as food, if there were too many pathogenic species, it would reduce the available food supply, thus causing them to starve.

A. potassium ion

B. sodium ion

C. chloride ion

D. fluoride ion

E. hydroxide ion

A. the polymerase chain reaction to amplify the DNA to have enough for further analysis

B. gas chromatography to study the lipid composition

C. peptide analysis to study protein fragmentsHalophiles

D. spectrophotometry to measure the cell concentration

Halophiles

A. must have 10%–20% NaCl levels to grow

B. must have 0.2%-5% NaCl levels to grow.

C. require halogen elements in large quantites.

D. live in the ocean.

Explanation / Answer

Answer for question number 1 : The correct option is D (Aquaporins)

Aquaporins or water channels which are the membrane associated proteins that facilitates movement of water into and out of the cells in microbes

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