Infectious Diseases 3 Homework
Which of the following statements best describes the end result of bacterial conjugation?
One cell has given a copy of a plasmid to another cell and kept one copy for itself.
Why is combination drug therapy for HIV/AIDS less likely to lead to resistance than single drug therapy?
The likelihood of one virus spontaneously mutating to be resistant to several different drugs at the same time is extremely small.
Homeostasis is a living organism's
ability to maintain constant internal conditions even when environmental conditions change.
Viruses are not alive because
they can only carry out photosynthesis and not cellular respiration.
Binary fission produces
two genetically identical bacterial cells
Antibodies are _____.
specialized proteins that attach to pathogens and disable them or mark them for destruction by immune cells
What is the condition called when your body's immune system overreacts to an otherwise harmless foreign particle?
Allergy
By what means do prokaryotes typically divide?
Binary fission
What is the most common STD that is caused by bacteria?
Chlamydia
Patients with advanced AIDS often die from infections that do little harm to healthy people. Why?
HIV infects and destroys the helper T cells of the immune system.
There are many organs and glands of the endocrine system, but which one is the master controller?
Hypothalamus
The urinary tract represents a portal of entry for E.coli, a normal inhabitant of the GI tract. Introduction of this opportunistic pathogen and its subsequent colonization is known as __________.
Infection
Following an injury to your hand, the injured area appears red and swollen. It feels painful and warm to the touch. What is the cause of these symptoms?
Inflammatory Response
How do vaccines convey long-term immunity to some pathogens?
Memory Cells
How does a bacterial cell obtain new DNA during the process of transformation?
Naked DNA from the surrounding environment is taken up by a bacterium.
Which of the following pathogens causes mad cow disease?
Prion
Which of these sub-cellular structures is found in both eukaryotes and prokaryotes?
Ribosomes
A virus enters your system and successfully invades and infects a cell. At this point it is vulnerable to recognition or attack by _____.
T cells
From which cell does the sex pilus originate during bacterial conjugation?
The donor cell
True or False. During bacterial conjugation, the recipient cell receives a single-stranded loop of DNA.
True
Which medication prevents viral infections by priming the immune system against a specific virus?
Vaccine
Which of the following can be found in bacteria, but not viruses? a cell membrane nucleic acids proteins genetic material
a cell membrane
When a B cell binds to a virus or other pathogen, it _____.
becomes activated, divides rapidly, and thereby mounts a specialized response against the pathogen.
Which of the following is NOT a characteristic of living things? creating energy responding to stimuli exhibiting complex organization having DNA as a genetic code being capable of reproduction
creating energy
A degenerative brain disorder transmitted by cannibalism is called
kuru
Some viral diseases are dangerous only when a person is infected for the first time; subsequent infections produce only mild symptoms or go entirely unnoticed. This pattern can be explained by the action of _____.
memory cells that trigger a secondary immune response
