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Q1. How can activity of insects or mites cause damage to plants that can be misdiagnosed as disease give examples? Describe the mechanical and chemical means used by pathogens to attack plants. Elucidate how plant pathognic attack can affect plant physiological process. Explain the pre-infectional and post -infectional processes used by plants in defence against plant pathogenic attack.
Q2. Approximately half of our vitamin K is synthesized by bacteria in the colon. Based on this information, why might taking a broad spectrum antibiotic produce frequent nosebleeds?
Analysis of preserved leaves shows that the density of stomata per unit area has decreased over the past 200 years. Suggest (and support) a hypothesis that explains this phenomenon.
What is the relationship between rate of recombination anddistance between two genes?
In explaining their findings, the authors have ignored a major threat to the validity of their estimates of exposure. Explain and discuss this error.
Design an enrichment culture medium and a protocol for the isolation and purification of a soil bacterium (e.g., Bacillus subtilis) from a sample of soil. Note possible contaminants and competitors. How will you adjust conditions of growth, and wh..
What is the probability that the fetus has inherited the disease allele D if the distance between the D locus and the microsatellite marker locus is: (A) 0 map units? (B) 2 map units? (C) 50 map units? Please explain how to do it. I already have t..
Lipids are a major energy molecule in ruminants, as opposed to many other animals. How are lipids used to make ATP? What are the specific types of lipids used by ruminants? Describe their pathways for ATP synthesis or other biochemical uses.
From the bits of plants remaining in the guts of some insects, researchers were also able to clone some of the Jurassic vegetation. They found that in one species of plants,
Why is the size of a bacterium more accurate for a negative stain than a direct staining method?
If you examined a microscope slide of a cell and noticed that the chromatid pairs were aligned in the center of the cell, how would you classify this stage of the cell cycle?
A recipe calls for 10 ml of a 25mM stock of EDTA. However, all you have on hand is a five hundred mM stock. How much more concentrated is what you have relative to what the recipe calls for?
Which of the following is associated with a deficiency of folate?
What is the effect of the non-hydrolyzable GTP analogue, GTP-?-S, on microtubule assembly and disassembly relative to GTP?
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