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For each of the following stressful environments, state what molecular stress the bacteria will face, and what action bacterial cells can take to cope with the stress.
A. A bacterium is placed in a hypertonic environmentB. A bacterium is placed in a hypotonic environmentC. A bacterium growing at 37 degrees C is suddenly shifted to 45 degrees CD. A bacterium growing at 37 degrees C is suddenly shifted to 20 degrees CE. A bacterium growing in an enriched medium is suddenly shifted to a minimal medium
Assume you have a set of 4-Hfr strains and you carry out a series of crosses with a multiply marked recipient that is auxotrophic for many different nutritional markers.
Two alleles at a loci, like for polydactyly. The dominant gene gives you six fingers on a hand. 20% of the alleles are dominant in a population, the rest are recessive.
Ligation of the multiple fragments and pBLU produces a number of different hybrid molecules, although not as many as you might expect.
Would you describe your study area as an area of high or low biodiversity?
what hormones are produced by the theca and granulosa cells of a maturing or pre-ovulatory follicle?
You are examining an algae, and note that the chloroplasts seem to have 3 or 4 membranes. What can you conclude about the origin of this algae, and what are two corroborating pieces of evidence that you could use to confirm your conclusion?
What is the functional significance of the orientation of collagen fibers in different lamellae in an osteon.
Aphids can reproduce sexually and asexually. Females reproduce by themselves and give birth to live females in summer. Describe how the reproductive variability of aphids might be an adaptation that permits them to survive very aggressive predation.
Assume you are a clinician in a small hospital and are monitoring the progression of myclonic epilepsy in twin boys. One twin remains only mildly affected by the condition.
You are studying compound X and are trying to determine whether it is a competitive or a non-competitive inhibitor of an enzyme reaction catalyzed by the enzyme zyrase.
If I wanted to test the drug to see if it made mice run faster, how could I test that and what would be my control?
You have identified a mutation in yeast, a unicellular eukaryote, that prevents the polyadenylation of the 3' end of RNA transcripts. However, there is no mutation in the enzyme that catalyzes the addition of A's or in the enzyme that cleaves the ..
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