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Penicillin is an irreversible inhibitor of the transpeptidases, enzymes that cross-link components of the bacterial cell wall. The cell wall is thus fragile and the bacteria die.
Penicillin and its derivatives are structural analogs of the natural substrates of these enzymes.
Why doesn't penicillin normally kill humans, unless a severe allergic reaction (anaphylaxis) develops? How does penicillin inhibit transpeptidase (what kind of inhibitor is it)?
What happen once the body has been exposed to a pathogen?
You are designing a new single-celled organism. Discuss the problems of size, getting molecules like nutrients and wastes in and out, temperature, energy and replication of genetic materials.
1. There are four (4) types of bone marrow transplants listed in your textbook. List each type of transplant, define the word parts, and provide a definition of the term.
Watch the 2-hour video,FRONTLINE: Poisoned Waters (PBS). Post a minimum of a 250-word summary and personal review, and make any connections with the readings.
What compound is produced in your body's skin to protect you against ultraviolet radiation?
Consider the kappa light chain for a mythical creature. This kappa light chain has 6 V regions and 7 J regions.
Different types of normal tissues in the human body have different mitotic indices. From the following list, which normal tissues would you expect to have the highest mitotic index: muscle, skin, kidney, or lung? Explain your answer.
write a paragraph about how a nerve impulse travels across a synapse +neurotransmitter combines
a type of gene therapy called rna interference rnai is being investigated to treat huntingtons disease - a disease
What if you wanted to sequence the DNA on both sides of a single known region? Design a protocol that would allow you to amplify the unknown regions of genomic DNA on both sides of a known region.
Using the lytic bacteriophage P22 you perform a three-factor cross in Salmonella typhimurium. The phage is initially grown on an Arg+ Leu+ His+ strain of S. typhimurium.
Consider a culture into which two E. coli strains are inoculated. Strain A is normal with g=21 min at 37 degrees C, and 42 mins at 27 degrees C. Strain B has a temperature-sensitive mutation, such that g=55 mins at 37 degrees C,
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