What is peptidoglycan Study guides, Class notes & Summaries

Why is the bacterial cell wall a good target for antibiotic action? There are 2 criteria it meets Correct Answer-- different than animal cells - essential for life How do gram-positive and gram-negative cells typically differ with respect to their cell envelope? Correct Answer-Gram positive: Thick peptidoglycan, no outer membrane Gram negative: outer membrane, thin peptidoglycan Why are gram-negative organisms typically more resistant to antibiotics? Correct Answer-The outer membrane ac...

Portage Learning BIOD 171 Lab Exams 1-8 Lecture Exams 2022 Lecture Exams 1. What three elements are used in an autoclave to sterilize equipment? heat, pressure, and steam 2. What is the minimum temperature an autoclave must be set at to achieve sterile condition? 125°C 3. If you are working in a lab in which an autoclave is not available, and you are pressed for time, which would you chose to best sterilize your equipment? Hot steam or hot air? Explain why you chose your answer. ...

antibiotic- old and new definition CORRECT ANSWER - originally referred to any compound produced by one species of microbe that could kill or inhibit the growth of other microbes. -today the term is also used for synthetic chemotherapeutic agents that are clinically useful but chemically synthesized. Selective toxicity CORRECT ANSWER -a quality of an antibiotic - Antibiotic must selectively kill or inhibit the pathogen but not the host, How is selective toxicity possible? CORRECT ANSWE...

Which of the following is a true statement concerning bacteria and archaea? CORRECT ANSWER While some bacteria are pathogenic to humans, no archaea are known to cause human diseases What was Leeuwenhoek's contribution to the science of microbiology? CORRECT ANSWER He developed the first microscope. characteristic of bacteria CORRECT ANSWER Have cell walls that contain peptidoglycan Derive nutrition from organic or inorganic sources or conduct photosynthesis characteristic of archaea...

What antiretroviral prevents entry into a CD4+ t-cell Enfuvirtide Severe pain after meals (better when she doesn't eat), unintentional weight loss, hx of atherosclerosis + abdominal bruit and absent pedal pulses. What artery could be atherosclerotic? Superior Mesenteric What is the inheritance pattern of Fragile X? How does transmission change if the mother has fragile X vs. the father? It is X linked dominant (like hypophosphatemic rickets and Alports) Mothers w/ disease: give ...

what connects bacterial cells during the exchange of genetic material? a. flagellum b. nucleoid region c. cell wall d. pilus d. pilus Which of the following is a function of peptidoglycan? a. Promotes phagocytosis b. Protects cells from bursting c. Allows bacteria to adhere to surfaces and each other d. Regulates movement of substances into and out of the bacterial cell b. Protects cells from bursting What term is used to describe bacterial cells that are spherical in shape? a. Baci...

A; Animals serve as a reservoir of infection" is the correct answer because Shigella only infects humans while Salmonella is found in many animals. Both have diarrhea as the major symptom. Endotoxin is produced by all gram negative bacteria and exotoxin is only produced by Shigella. A major difference between Salmonella enterica and Shigella infections is that only in salmonellosis can: A. animals serve as a reservoir of infection B. diarrhea become the major symptom C. endotoxin play a ...

Exams 1. What are the two major types of nucleic acids and their roles? DNA- deoxyribonucleic acid RNA- Ribonucleic acid DNA- Cellular life has DNA and a role that DNA has is long-term s torage of information, it holds the characteristics of living organisms. RNA- Is the carrier of information in form of amino acid sequence. It converts the information in the DNA and synthesizes proteins True or False: Archaea is noted for its ability to survive under harsh conditions. True. Archaea can often be...

What are the three domains of life? Correct Answer-Bacteria, Archaea, Eukarya Which groups are more closely related from an evolutionary standpoint? Correct Answer-Archaea and Eukarya What are the three different shapes of bacterial cells? Correct Answer-1) coccus- spherical 2) bacillus- rod shaped 3) spirilla- wavy/ corkscrew shaped What are the three different ways in which bacteria arrange themselves in colonies? Correct Answer-1) diplo- divide but stay attached to each other (OO...

Do gram + or - cells have an outer-membrane? gram negative What component of a bacterial cell is made of peptidoglycan? cell wall Describe the order of membranes in bacterial cells? Capsule (all cells) Outer membrane (gram - only) Cell wall (peptidoglycan) Cytoplasmic membrane