8. What is a Durham tube? Why is it added to a PR carbohydrate test? Could you obtain the same data provided by a Durham tube by removing it from the tube and adding something else to the medium? If so, what new component would you add to the medium.

In a short essay (100-150 words), explain why intersexual selection often leads to sexual dimorphism.

Compare and contrast the gene expression regulation mechanisms of prokaryotic and eukaryotic organisms. (essay)

As a class, we added several different reagents to our Winogradsky columns. We also made one control-column that had nothing added to it (aside from sediment and water). Everyone added paper towels (but at varying depths), and sulfate to the bottom of their columns. The rest of the treatments are listed below. Please indicate what types of organisms you might enrich with that type of treatment and why, or how and why that treatment might result in a different type of growth rate or metabolic rate. (Possible organisms are listed but not limited to: Oxygenic phototrophic microorganisms, Diatom, Cyanobacteria, Filamentous algae, Purple sulfur-oxidizing phototrophic bacteria, Green sulfur-oxidizing phototrophic bacteria, Aerobic heterotrophs, Fermenting bacteria, Sulfate-reducing bacteria...)

• 10mM Nitrate only:
• 100mM Nitrate only:
• 10mM Phosphate only:
• 100mM Phosphate only:
• 10mM Nitrate + Phosphate:
• 100mM Nitrate + Phosphate:
• 10mM Nitrate + Phosphate + 1mM DIC (bicarbonate):
• 100mM Nitrate + Phosphate + 6mM DIC (bicarbonate):

cite four reasons why an individual might not develop an infectious disease after exposure to a pathogen? discuss the four period or phases in the course of an infectious disease.

Which of the following types of mutations can affect the length of the mRNA molecule?Check all that apply.

Check All That Apply

• Substitution mutation in an intron.Substitution mutation in an intron.

• Deletion of 1 nt in an exon.Deletion of 1 nt in an exon.

• Deletion of 2 nt within an intron that does not affect splicing.Deletion of 2 nt within an intron that does not affect splicing.

• Addition of 3 nt within an exon.Addition of 3 nt within an exon.

• Addition of 2 nt within an exon.Addition of 2 nt within an exon.

• Substitution mutation in the middle of an exon.Substitution mutation in the middle of an exon.

• Deletion of 3 nt within the 3' UTR.Deletion of 3 nt within the 3' UTR.

• Addition of an AUG within the 5' UTR.Addition of an AUG within the 5' UTR.

• Substitution mutation within the 3' UTR.

What is the probability that Drosophila Melanogaster female has received all the chromosome that her grandmother gave to her father?

A : 0

B : (1/4)^2

C : (1/6)^2

D : (1/2)^4

E : No way to predict.

Please explain your answer thoroughly!

The following chart show the results of cloning nuclei from several cell lines (e.g. v6.5, v18.6, etc.) derived from two different genetic strains of mice (F1 and 129). Note: your answers require no prior knowledge of these strains or the specific cell lines listed)

1. What is the main conclusion that can be drawn based on the results of these data with respect to success of the cloning experiments?
2. Give three possible cell intrinsic differences between v6.5 cells and LJG-13 cells that could play a role in their different results in this assay.

For one of the three potential factors you mention above, describe a brief experimental plan to test whether this factor is responsible for the differences between v6.5 cells and LJG-13 cells in this assay. Include in this plan roughly how you would perform the experiment, what your readout would be and what you could conclude based on your results.

hello I need a gene that produces an enzyme that can be easily assayed for activity.

please give me at least three choices

thanks

What is β-Carotene? Why is β-Carotene important? How is β-Carotene metabolized?

If you not mind, can you type the answer.I do not understand handwriting in sometime. Please

Thanks

1. Describe one reason why rRNA used to determine evolutionary relationships between organisms.

2. Describe the original procedure used by Woese and his students to determine the SSU rRNA sequences.

3. Describe the evidence that Woese and Fox found that supported the idea that there were three domains of life.

4. Describe the evidence that Woese and Fox found that supported the idea that the chloroplast evolved from cyanobacteria.

How does the structure of mRNA relate to its function?

Why is it necessary to find the new vector plasmid concentration after undergoing digestion and the clean up?

During the digest clean up what buffers are used and what is the purpose of each one?