
Prescott's Microbiology
10th Edition
ISBN: 9781259281594
Author: Joanne Willey, Linda Sherwood Adjunt Professor Lecturer, Christopher J. Woolverton Professor
Publisher: McGraw-Hill Education
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Chapter 42.1, Problem 5RIA
Summary Introduction
Vaccines:
A vaccine is a prophylactic measure to prevent the occurrence of a certain disease. It usually involves suspension or killing of weak pathogens or its components that are responsible for the disease. The vaccination is usually injected to humans or animals.
Vaccination has played a great role in extinction of diseases such as small pox and polio. They may also confer passive immunity by providing antibodies or lymphocytes already made by an animal or human donor.
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Which of the following best describes why it is difficult to develop antiviral drugs? Explain why.
A. antiviral drugs are very difficult to develop andhave no side effects
B. viruses are difficult to target because they usethe host cell’s enzymes and ribosomes tometabolize and replicate
C. viruses are too small to be targeted by drugs
D. viral infections usually clear up on their ownwith no problems
This question has 3 parts (A, B, & C), and is under the subject of Nutrition. Thank you!
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Chapter 42 Solutions
Prescott's Microbiology
Ch. 42.1 - Why are the cells first fed lactose and then...Ch. 42.1 - What critical limiting factors are used in the...Ch. 42.1 - Prob. 2RIACh. 42.1 - Discuss the major uses for biopolymers and...Ch. 42.1 - What kinds of molecular changes result from...Ch. 42.1 - Prob. 5RIACh. 42.2 - Why is there interest in developing alternatives...Ch. 42.2 - What types of microbes are good candidates for the...Ch. 42.3 - What is the objective of the scale-up process and...Ch. 42.3 - What parameters can be monitored in a modern,...
Ch. 42.3 - Which of the following are secondary metabolites:...Ch. 42.4 - Why are modular genes particularly suitable as...Ch. 42.4 - Prob. 2MICh. 42.4 - Prob. 1RIACh. 42.4 - Prob. 2RIACh. 42.4 - What is metabolic engineering? Besides...Ch. 42.4 - What is high-throughput screening and why has it...Ch. 42.4 - Prob. 5RIACh. 42.5 - What is the Ti plasmid and how is it modified for...Ch. 42.5 - How is Bt toxin produced and why is it so widely...Ch. 42.5 - Can you think of other traits that might be...Ch. 42.6 - MICRO INQUIRY Why is it advantageous to have the...Ch. 42.6 - Why are diatoms and magnetotactic bacteria of...Ch. 42.6 - Prob. 2RIACh. 42 - Prob. 1CHICh. 42 - Prob. 2CHICh. 42 - The detection of unexploded land mines is a...
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- Use the following information to answer the question(s) below. Martin Wikelski and L. Michael Romero (Body size, performance and fitness in Galápagos marine iguanas, Integrative and Comparative Biology 43 [2003]:376-86) measured the snout-to-vent (anus) length of Galápagos marine iguanas and observed the percent survival of different-sized animals, all of the same age. The graph shows the log snout-vent length (SVL, a measure of overall body size) plotted against the percent survival of these different size classes for males and females. Survival (%) 100- 80- 60- 40- 20- 0+ 1.9 T 2 2.1 2.2 2.3 2.4 2.5 2.6 2.7 Log SVL (mm) 19) Examine the figure above. What type of selection for body size appears to be occurring in these marine iguanas? A) directional selection B) stabilizing selection C) disruptive selection D) You cannot determine the type of selection from the above information. 3arrow_forward24) Use the following information to answer the question below. Researchers studying a small milkweed population note that some plants produce a toxin and other plants do not. They identify the gene responsible for toxin production. The dominant allele (T) codes for an enzyme that makes the toxin, and the recessive allele (t) codes for a nonfunctional enzyme that cannot produce the toxin. Heterozygotes produce an intermediate amount of toxin. The genotypes of all individuals in the population are determined (see table) and used to determine the actual allele frequencies in the population. TT 0.49 Tt 0.42 tt 0.09 Refer to the table above. Is this population in Hardy-Weinberg equilibrium? A) Yes. C) No; there are more homozygotes than expected. B) No; there are more heterozygotes than expected. D) It is impossible to tell.arrow_forward30) A B CDEFG Refer to the accompanying figure. Which of the following forms a monophyletic group? A) A, B, C, and D B) C and D C) D, E, and F D) E, F, and Garrow_forward
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