Mastering Micro HW CHap 19/23

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Chemotherapy to inhibit the progression of HIV infection utilizes all of the following mechanisms EXCEPT
ANSWER:
blockage of viral attachment.
termination of viral DNA.
destruction of viral ribosomes.
inhibition of viral proteases.
prohibition of viral integration into host cell DNA.

destruction of viral ribosomes.

Which of the following correctly lists the current distribution of HIV infection and AIDS in order of DECREASING prevalence?
ANSWER:
sub-Saharan Africa, Western Europe, Latin America, Australia / New Zealand
sub-Saharan Africa, Australia / New Zealand, Western Europe, Latin America
sub-Saharan Africa, Latin America, Western Europe, Australia / New Zealand
Latin America, sub-Saharan Africa, Western Europe, Australia / New Zealand

sub-Saharan Africa, Latin America, Western Europe, Australia / New Zealand

The level of HIV population in the blood is highest:

When the patient is asymptomatic

Early indication of immune system failure is provided by:

Falling levels of CD4+ cells

Worldwide, the primary method of transmission of HIV is

heterosexual intercourse

HIV attack of CD4+ T cells causes suppression of both cell-mediated and humoral immune responses.
ANSWER:
True
False

TRUE

Which statement regarding the infectiveness and pathogenicity of HIV is FALSE?
ANSWER:
During latent infections, the provirus directs the synthesis of many new viruses.
Attachment of HIV to the target cell depends on the glycoprotein spike (gp120) combining with the CD4+ receptor.
Some cells that do not carry the CD4 molecule can become infected with HIV.
The ability of the HIV to remain as a provirus shelters it from the immune system.

During latent infections, the provirus directs the synthesis of many new viruses.

HIV is a retrovirus with single-stranded RNA.
ANSWER:
True
False

TRUE

A patient exhibiting arthritis secondary to Lyme disease is likely in which phase of the infection?

third

Lyme disease is caused by ____________ and is transmitted by __________.

B. burgdorferi; Ixodes

Based on the concept map, which of the following must happen during Lyme disease?
ANSWER:
There is an adaptive immune response.
There is massive inflammation of the meninges.
A bull's-eye-shaped rash will develop.
All of the above happen.

there is an adaptive immune response

Which of the following cell populations become plasma cells?

B cells

In which of the following North American locations would you expect to find the highest incidence of infection with Borrelia burgdorferi?
ANSWER:
Gulf of Mexico
Pacific coast
Colorado
Atlantic coast

Atlantic Coast

As a child, Jamie suffered from rheumatic fever, which caused some major damage to one of her heart valves. She is OK, in general. However, she's been advised against getting body piercings, and her dentist gives her antibiotics before performing some dental procedures. What is the concern?

more likely to develop subacute bacterial endocarditis

Cats have been identified as an essential part of the life cycle for the protozoan that causes which disease?

toxoplasmosis

Which of the following is FALSE concerning Clostridium species?
ANSWER:
They grow well in damaged tissues that are necrotic and have impaired blood flow.
They can cause gas gangrene and septicemia.
Their main reservoir is rabbits.
They grow only in anaerobic environments.

there main reservoir is rabbits

Which statement regarding the emerging viral hemorrhagic fevers is FALSE?
ANSWER:
A person may contract Hanta Pulmonary Syndrome after exposure to the urine of an infected rodent.
The symptoms of infection by hemorrhagic viruses are initially mild.
Hemorrhagic viruses cause profuse bleeding, and this helps to spread the infection.
Later symptoms of hemorrhagic viral infection include low-grade fever and severe, crippling joint pains.

Later symptoms of hemorrhagic viral infection include low-grade fever and severe, crippling joint pains.

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