What is the source of energy used to power the sodium-potassium pump?
What will be an ideal response?
The breakdown of ATP
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____ are dome-shaped structures composed of
layers of early cells and sediments.
a. Meteorites b. Pumice stones c. Stromatolites d. Rhyolites e. Ignimbrites
Emigration happens when individuals move a population, while immigration happens when individuals move a population.
A. by extrapolation towards; by dispersion from B. by dispersion through; by extrapolation at the periphery of C. out of; into D. due to environmental resistance within; due to carrying capacity within E. into; out of
Evidence suggests that factors which contribute towards the virulence of E. coli strain O157:H7, a bacterial strain reported to cause several food poisoning deaths, are caused by genes from a virus that infects bacteria
Considering this evidence, which statement most likely explains how the O157:H7 population acquired the genetic variation that distinguishes the strain from harmless E. coli strains, such as those that reside in our intestines? A) The virus entered the bacterial cell and incorporated its DNA into the bacterial genome, allowing the bacteria's cellular machinery to create new viruses. B) Viral envelope proteins bind to receptors on the bacterial membrane, allowing the viral genetic material to enter the bacterium and become translated into proteins. C) The virus entered the cell and acquired specific genes from the bacteria to increase the virulence of the virus. D) The virus infected the bacterium, and allowed the bacterial population to replicate with a copy of the phage genome in each new bacterium.
Among the variety of virulence factors possessed by pathogenic enteric bacteria, which ones allow them to evade the immune surveillance of its host?
What will be an ideal response?