justokaies

1. What is longitudinal diffusion in the context of chromatography, and how can it be reduced during a chromatographic separation?

2. What is eddy diffusion in the context of chromatography, and how can it be reduced during a chromatographic separation?

3. What is mass transfer (equilibration) in the context of chromatography, and how can it be reduced during a chromatographic separation?

An explanation of the principles behind the chromatographic separations and their suitability

What is the difference between the solute (or osmotic) potential and the pressure potential?

The most widely accepted theory for ascent of sap in trees is

(a) capillarity

(b) role of atmospheric pressure

(c) pulsating action of living cell

(d) transpiration pull and cohesion theory of Dixon and Jolly.

A mutation occurs during meiosis. What is the least likely outcome for the resultant offspring containing this mutated allele? Please include an explaination to the answer

a. The mutation is neutral: it has no discernable fitness effect

b. The mutation is lethal: the offspring does not survive

c. The mutation is advantageous: the offspring has higher fitness than the parent.

d. The mutation is somewhat deleterious: the offspring has lower fitness than the parent but does not die outright.

One argument often given in favour of saving current andplanting additional plants/saplings is the roots hold soil togetherand prevent soil erosion.

Unlike plants that may be uprooted, a large tree may only bechopped down; its roots continue to remain buried. Do these, nowdead, roots continue to prevent soil erosion, or does the planthave to be alive and kicking?

My guess is the latter, perhaps because absorption of waterpossibly 'compresses' the soil over the root.

There is evidence of a phenomenon called quorum sensing in rotifers. Under certain conditions, a chemical released by females who usually reproduce asexually results in males being produced. The presence of these males allows sexual reproduction. What conditions would most likely lead to a switch to sexual reproduction?

how many pi bonds and sigma bonds does the chemical compound caffeine has, and where can one get some information on hybrid orbitals on aromatic compounds like benzene and caffeine? thanks.

Taxol as a complex drug and caffeine as a simple drug.

What are the pros and cons of both when chemically synthesizing the drug?.