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The sexually transmissible disease gonorrhea has become increasingly resistant to treatment with antibiotics. What is the most likely scientific explanation?
A. The gonorrhea bacteria learned to avoid antibiotics
B. The gonorrhea bacteria changed their genes when they sensed antibiotics
C. Antibiotic-sensitive gonorrhea bacteria died out, but antibiotic-resistant gonorrhea bacteria have flourished and persisted
D. The antibiotic increased the mutation rate in the gonorrhea bacteria
Which chemical modification do we associate with changing the activity of an enzyme in a transient/non-permanent manner?
Think about the fructose-1,6-bisphosphatase reaction. Calculate the free energy change if the ratio of the concentrations of the products to the concentrations of the reactants is 24.1,
The nucleotide sequence of a DNA section is GTA. A mRNA molecule with a complementary codon is transcribed from the DNA. In the process of protein synthesis, a tRNA pairs with the mRNA codon. What is the nucleotide sequence of the tRNA anticodon?
q1. an experiment is designed to study mechanism of sucrose uptake by plant cells. cells are immersed in a sucrose
One class of aminoacyl tRNA synthetases possesses "proofreading" abilities. An experiment was carried out where a cysteine attached to tRNA was chemically modified to an alanine.
q1. if molecular mass of a carbon atom is 12 the mass of a hydrogen atom is 1 and the mass of an oxygen atom is 16
Illustrate the texture and arrangement of the lungs of the cat. If you were asked to create a karyotype from the chromosome spreads you made from HeLa cells, list materials you could use and describe how you would create the karyotype.
What happens to the rate of oxygen evolution when DCMU, a blocker of electron transport, is added? why?
Describe the significance of the CCR5 gene in rendering resistance to HIV infection in certain individuals. We discussed this in detail in class. Be sure to mention how this all relates to the infection cycle of HIV and how this trait may have bee..
Antibiotics such as tetracycline, streptomycin, and chloramphenicol have a broad spectrum of activity against prokaryotic cells. Why do these antibiotics lack inhibitory activity against eukaryotic cells like fungi?
Red-green colorblindness is a sex-linked trait. A normal woman whose father was red-green colorblind marries a normal man. What is the expected proportion of color-blind children? Five both the phenotypes and genotypes, including gender.
What is the advantage of radial symmetry for sessile animals such as hydras and bilateral symmetry for mobile animals such as planaria? Also, what major evolutionary trends accompany bilateral symmetry?
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