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- There have been recurring cases of mad-cow disease in the United Kingdom since the mid-1990s. Mad-cow disease is caused by a prion, an infectious particle that consists only of protein. In 1986, the media began reporting that cows all over England were dying from a mysterious disease. Initially, there was little interest in determining whether humans could be affected. For 10 years, the British government maintained that this unusual disease could not be transmitted to humans. However, in March 1996, the government did an about-face and announced that bovine spongiform encephalopathy (BSE), commonly known as mad-cow disease, can be transmitted to humans, where it is known as variant Creutzfeldt-Jakob disease (vCJD). As in cows, this disease eats away at the nervous system, destroying the brain and essentially turning it into a spongelike structure filled with holes. Victims experience dementia; confusion; loss of speech, sight, and hearing; convulsions; coma; and finally death. Prion diseases are always fatal, and there is no treatment. Precautionary measures taken in Britain to prevent this disease in humans may have begun too late. Many of the victims contracted it over a decade earlier, when the BSE epidemic began, and the incubation period is long (vCJD has an incubation period of 10 to 40 years). A recent study concluded that 1 in 2,000 people in Great Britain carry the abnormally folded protein that causes vCJD. In spite of these numbers, the death rate from vCJD remains low. It is not clear whether this means that the incubation period for the disease is much longer than previously thought, or whether they may never develop the disease. If you were traveling in Europe, would you eat beef? Give sound reasons why or why not.There have been recurring cases of mad-cow disease in the United Kingdom since the mid-1990s. Mad-cow disease is caused by a prion, an infectious particle that consists only of protein. In 1986, the media began reporting that cows all over England were dying from a mysterious disease. Initially, there was little interest in determining whether humans could be affected. For 10 years, the British government maintained that this unusual disease could not be transmitted to humans. However, in March 1996, the government did an about-face and announced that bovine spongiform encephalopathy (BSE), commonly known as mad-cow disease, can be transmitted to humans, where it is known as variant Creutzfeldt-Jakob disease (vCJD). As in cows, this disease eats away at the nervous system, destroying the brain and essentially turning it into a spongelike structure filled with holes. Victims experience dementia; confusion; loss of speech, sight, and hearing; convulsions; coma; and finally death. Prion diseases are always fatal, and there is no treatment. Precautionary measures taken in Britain to prevent this disease in humans may have begun too late. Many of the victims contracted it over a decade earlier, when the BSE epidemic began, and the incubation period is long (vCJD has an incubation period of 10 to 40 years). A recent study concluded that 1 in 2,000 people in Great Britain carry the abnormally folded protein that causes vCJD. In spite of these numbers, the death rate from vCJD remains low. It is not clear whether this means that the incubation period for the disease is much longer than previously thought, or whether they may never develop the disease. What measures have been taken to stop BSE?Adapting to Host Defenses Surface proteins called HLAs allow white blood cells to detect HIV particles and fight an infection. In a recent study, scientists tested whether HIV is adapting to this host defense. They did so by looking at the frequency of a specific mutation (1135X) in HIV. This escape mutation helps the virus avoid detection by a version of the HLA protein (HLA-B51) that is common in some regions of the world, but not in others. FIGURE 20.19 shows the percentage of HIV-positive people who had HIV with the 1135X mutation. Data were collected at medical centers from several parts of the world. FIGURE 20.19 Regional variation in the frequency of the 1135X escape mutation among HIV-positive people. For each region, pink bars represent the percentage of people whose blood cells have HLA-B51. and thus cannot detect 1135X mutants. Blue bars represent the percentage of people with other versions of the HLA protein. These people have blood cells that can detect and fight HIV even if it has the 1135X mutation. 4. Japan has a high frequency of HLA-B51; about half the population has it. How might this explain the high frequency of the 1135X mutation in Japanese with other HLAs?
- Which of the following highly contagious viruses is a single-stranded ribonucleic acid (RNA) virus with a helical capsid and envelope and is transmitted by coming in contact with respiratory secretions? "This is a highly contagious respiratory illness transmitted when an infected person coughs or sneezes virus particles into the air," the health department said in a written statement. "It's so contagious that if one person is sick and spreading measles, nine out of 10 people around them who aren't immune will get it, too." Group of answer choices a. Measles b. Parvovirus c. Coxsackie virus A d. RhinovirusWhich of the following human diseases is caused by a virus that requires reverse transcriptase to transcribe its genome inside the host cell? AIDS influenza none of them smallpox herpesThe common cold is caused by the? Lion virus Rhino virus Giraffe virus Viper virus None of above
- The virion illustrated below is a O Bacteriophage O poxvirus O HIV retrovirus O AdenovirusThe diagram below shows the Covid-19 virus with its spike protein. It also shows the area on the spike protein which binds to the ACE2 receptor (receptor binding domain). Corona Virus Receptor Binding Domain (RBD) Spike Protein In order to get into a cell, the Covid-19 virus needs to bind to the ACE2 receptor. Once bound it is brought into the cell. These receptors are found on cells making up various tissues (oral and nasal mucosa, nasopharynx, lung, stomach, small intestine, colon, skin, lymph nodes, thymus, bone marrow, spleen, liver, kidney, and brain). The symptoms for Covid-19 are linked to the tissue cells the virus infects. To the right is a diagram showing the biding of the spike protein to the ACE2 receptor. SARS-COV-2 Spike (S) Host Cell ACE2 acerBacterial meningitis can be caused by a variety of bacteria. It's symptoms can include fever and headache O neck stiffness confusion, convulsion and coma O all of the above
- These family of viruses contain DNA as their genetic material, EXCEPT: O All of these contain DNA as their genetic material O HPV O Herpes virus O Rotavirus HIVWhich of the following viral diseases can cause paralysis? O Polio O Mumps O Rabies O HIV O CoronavirusAbout how many species of viruses do people have In there lungs on average 17 1750 175 None None of these choices