
To tell:
Why is the
Introduction:
Digestive system in humans consists of gastrointestinal tract and accessory organs. The organs mainly involved in the digestive system are salivary glands, pharynx, esophagus, stomach, rectum, small, and large intestine.

Explanation of Solution
Most of the microorganism enter into the human body through a portal of entry and cause disease. Mostly microorganism enters through the skin, respiratory tract, digestive tract, and genitourinary tract. The skin is the largest organ in the body and several micro-organisms are present in the skin. But, they cannot enter into the skin. Through the respiratory tract, microorganism spread during inhalation. When compared to the other portal entry, the important portal of entry for the microorganism is digestive tract. The digestive system is infested by eating contaminated food and drinking water, which enter the digestive tract and cause disease. For example, typhoid and cholera.
The important portal entry of the microorganism is through the digestive system.
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Chapter 23 Solutions
Microbiology with Diseases by Body System (5th Edition)
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- HAND DRAW There should be two proarrow_forwardMolecular Biology Question. Please help solve. Thanks. Please draw how two nucleotide triphosphates are linked together to form a dinucleotide, and label the 5' and 3' ends of the resulting dinucleotide.arrow_forwardWhat is a reversion in molecular biology?arrow_forward
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- 24) 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_forwardMolecular Biology Question. Please help with step solution and explanation. Thank you: The Polymerase Chain Reaction (PCR) reaction consists of three steps denaturation, hybridization, and elongation. Please describe what occurs in the annealing step of the PCR reaction. (I think annealing step is hybridization). What are the other two steps of PCR, and what are their functions? Next, suppose the Tm for the two primers being used are 54C for Primer A and 67C for Primer B. Regarding annealing step temperature, I have the following choices for the temperature used during the annealing step:(a) 43C (b) 49C (c) 62C (d) 73C Which temperature/temperatures should I choose? What is the corresponding correct explanation, and why would I not use the other temperatures? Have a good day!arrow_forward
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