signs and symptoms
name 2 common signs of infection on skin.
redness and swelling.
What is the protective protein layer that covers a virus's genetic material?
The capsid
In which cycle does a virus rapidly reproduce and then break open the host cell to release new progeny?
The lytic cycle
What is the definition of cancer?
Unchecked cell growth caused by mutations in the genes of a cell
What type of organism lives on or in a host to get food at the host's expense, but usually doesn't try to kill it?
A parasite
what is the difference between a symptom and a sign?
Why are viruses considered nonliving?
They do not consume nutrients, grow, perform cellular respiration, or have internal organelles like a nucleus or cytoplasm
What is the name for a virus that specifically infects and takes over a bacterial cell?
A bacteriophage
What is the difference between a benign tumor and a malignant tumor
Benign tumors do not migrate to other parts of the body; malignant tumors can spread and cause cancer to reach other regions
These disorders are caused by errors in DNA sequences that result in proteins being made incorrectly or not at all.
Genetic disorders
why is it important to seek medical advice for bacterial infections?
without proper treatment,bacterial infections can cause serious harm
What are individual virus particles called?
Virions
In the lysogenic cycle, where does the virus hide its genetic material?
It integrates itself into the host cell’s chromosomes
Why do cancer cells divide faster than normal cells?
They spend less time in interphase and have fewer checks during the S-phase of the cell cycle.
What is a common "vector" for the parasite that causes Malaria?
A mosquito
how do symptoms like fever and infection help the bodyfight infection?
fever raises body temperature to slow germs;nausea helps expelharmful substances
What specific structure do viruses with a "viral envelope" use to attach to host cell receptors?
Glycoproteins
What is the term for the process where new virions "burst forth" from a host cell, destroying it?
It lysis
Name three common treatments used by doctors to fight cancer.
Surgery, radiation, and chemotherapy
What environmental contaminant, often found in old homes, can cause memory problems and irritability?
lead paint.
how do signs and symptoms help doctors determine if an illness is caused by virus or bacteria?
certain symptoms and signs are typical for viruses,or bacteria,helping diagnosis
How much smaller are virions compared to bacteria?
They are approximately 100 times smaller than bacteria and cannot be seen with a light microscope
How does the lysogenic cycle affect the host's daughter cells?
The host cell replicates the viral DNA along with its own, passing it on to all new daughter cells
What did Dr. William G. Kaelin, Jr. discover about mutated tumor suppressor genes?
Mutations cause tumors to produce large amounts of protein, which provides cancer cells with extra blood for growth
How do vaccines help the body prevent viral infections?
They train the immune system to create antibodies that fight off the disease upon exposure