BIO 438 Q&A Bundle

What is the direct consequence of bacteria that cannot make their cell walls correctly because of antibiotics that inhibit cell wall synthesis? The bacteria tend to lyse due to osmosis. Which answer best explains why antibiotics targeting the cell wall of bacteria have few side effects on people? P...

Select the statements below that correctly apply to characteristics of bacterial cell permeability. - has presence of aquaporins - is a barrier to passive diffusion of large compounds - is a barrier to water - can take up insoluble molecules - has presence of aquaporins - is a barrier to passive dif...

Oxygenic photosynthesis -found in cyanobacteria -uses H2O as proton donor -Produces O2 -2 photosystems -linear flow of electrons -uses Calvin cycle -uses Chl a Anoxygenic photosynthesis -uses H2S as proton donor -produces S -green sulphur bacteria use reverse cycle to incorporate CO2 rather than pr...

Tinbergen's four functions Sexual isolation to prevent breeding between different species, which assumes this is a bad thing (it often is although not always), Orientation in space Synchronization in time Persuasion -change a partner's motivation to make mating more likely. Persuasion may overcome...

Bright field The most commonly used type of microscopy is called _____, because the specimens produce dark images against brighter backgrounds. Dark field In ______ microscopy, however, bright images on a darker background are produced because only light that is refracted by the specimen is capture...

What is nitrification? What are the two steps of the process? Oxidation of ammonia (NH4+) to nitrite (NO2-) and Nitrate (NO3-) 1. ammonia oxidation to nitrite by ammonia-oxidizing bacteria (AOB) NH3 + O2 + ADP + Pi --> NO2- + H+ + ATP 2. nitrite oxidation to nitrate by nitrite-oxidizing-bacter...

Some molecules needed for survival cannot be synthesized by the cell but instead must be obtained from the environment. These types of molecules include vitamins and amino acids and are collectively called ______ ______. growth factors The movement of dissolved solutes from a region of higher conce...

Suppose that you made a special mutation in the laci protein that blocked its binding to allolactose but did not affect its ability to bind to laco. What effect would this mutation have on: A) the expression of the lac operon? B) the ability the cell to use lactose as carbon source? a. Eliminate exp...