Exam 3: Microscopy and Cell Structure

Basic dyes

Please select the CORRECT pair.

The Gram stain and the endospore stain both use

Which amino acid is found only in the cell walls of bacteria?

You discover a new pathogen which you visualize using a light microscope. A negative stain reveals a clear halo around the cells. This suggests to you that the organism

Prokaryotes may ingest particles via phagocytosis.

Your instructor wants you to bring in an example of a biofilm to your lab. Which choice is the best selection for bringing in an intact biofilm for further study?

You tell your friend you think she may actually have pneumonia caused by Mycoplasma pneumoniae, a ________ organism that lacks a ________.

An electron microscope must use electromagnet "lenses" shaped like donuts (with a hole in the middle) to direct the electrons onto the specimen. Why aren't they solid, like the lenses in a light microscope?

A new medication is developed that targets and binds to the lipid A portion of LPS in Gram-negative bacterial cells. This drug shows a high degree of binding and activity against purified lipid A in an experiment carried out in test tubes. Based on this information,

The use of oil with certain high-power objective lenses increases

A research laboratory is trying to produce new antibiotics. They come up with a medication that detaches the hydrophilic heads from the phospholipids in cytoplasmic membranes. This drug

Your roommate at college complains of a sore throat, fatigue, fever, cough, and chest pain. She thinks she has a cold, although she has not had a runny nose or any sneezing, and she has been feeling bad for more than a week. You persuade her to go to the urgent care, which she does. She comes home with a prescription for penicillin, telling you that she was told that she likely has pneumonia, caused by Streptococcus pneumoniae. She takes the penicillin according to instruction but doesn't feel any better, so she goes back to the urgent care facility. This time, the physician's assistant on shift takes a sputum sample and sends it for analysis. He also prescribes tetracycline for your friend. This antibiotic targets protein synthesis. Your friend takes the medication and recovers fully. -You explain to your roommate that penicillin is an antibiotic that interferes with the synthesis of peptidoglycan. Peptidoglycan

Lysosomes are bags of digestive enzymes found in prokaryotic cells.

Select the False statement regarding the proton motor force.

Phagocytosis

The resolving power of a microscope is described as the ability of the microscope to

Which of the following microscope types would be least useful in viewing unstained living cells?

An advantage of the smaller size of prokaryotes, compared to eukaryotes, is

If everything else is equal, the best way to observe more details in a microscopic specimen is to