help with biology questions?
1.Which allergen is likely to be found during a certain time of year?
A.Pollen
B.Metals
C.Animal dander
D.Certain foods
2.What happens when an allergen enters the body?
A.Memory B cells produce antibodies.
B.Histamine is released
C.Inflammation decreases
D.A specific immune response begins.
3.What does not occur in anaphylaxis?
A.The airways tighten.
B.Blood vessels become porous, causing blood to leak out.
C.Blood pressure increases rapidly.
D.Oxygen does not reach body cells.
4.Which autoimmune disease affects the nervous system?
A.Multiple sclerosis
B.Type one diabetes
C.Graves' disease
D.Rheumatoid arthritis
5.How are an allergen and an antigen similar?
A.Both are protein markers on cell or particle surfaces.
B.Both trigger a cellular immune response.
C.Both are parts of pathogens.
D.Both are involved in autoimmune diseases.
6.How are HIV and AIDS different?
A.HIV contains RNA; AIDS contains DNA.
B.HIV is the virus that causes AIDS, a disease of the immune system.
C.HIV reproduces in B cells; AIDS reproduces in T cells.
D.AIDS is an opportunistic infection.
7.How does leukemia cause disease?
A.It causes bone marrow to produce red blood cells instead of white blood cells.
B.It causes tumors to form in the bone marrow.
C.It causes bone marrow to make defective white blood cells and to not make enough red blood cells.
D.It produces too many mature white blood cells.
8.How can leukemia be cured?
A.By receiving transfusions of white blood cells
B.By replacing the diseased bone marrow
C.By killing immature blood cells with chemotherapy
D.By giving immature blood cells time to mature
9.Why does a person feel healthy, at first, after being infected with HIV?
A.Antibiotics are effective against HIV when a person is first infected.
B.HIV has not yet started mutating.
C.HIV infects blood cells, but produces fewer virus particles from each blood cell.
D.The body still has many T cells that are not infected.
10.Why can't a person with AIDS make antibodies against HIV?
A.B cells are needed to activate T cells, which make antibodies.
B.B cells are destroyed by HIV.
C.HIV mutates too quickly for the body to make antibodies.
D.T cells are needed to activate B cells, which make antibodies.
- Tony
Numero uno isssss. A.
unbelievable
- Perri
1. A
2. A
3. don't know
4. A
5. B
6. B
7. C
8. C
9. B
10. C
some of them might not be correct but i hope this helped :)
Leukemia — Comprehensive overview covers symptoms, causes, risk factors, treatment of this blood-related cancer.
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BeatCancer;;DisneyGirls[reupload]
Defining cancer Cancer is a term used for diseases in which abnormal cells divide without control and are able to invade other tissues. Cancer cells can spread to other parts of the body through the blood and lymph systems. Cancer is not just one disease but many diseases. There are more than 100 different types of cancer. Most cancers are named for the organ or type of cell in which they start -- for example, cancer that begins in the colon is called colon cancer; cancer that begins in basal cells of the skin is called basal cell carcinoma. Cancer types can be grouped into broader categories. The main categories of cancer include: Carcinoma - cancer that begins in the skin or in tissues that line or cover internal organs. Sarcoma - cancer that begins in bone, cartilage, fat, muscle, blood vessels, or other connective or supportive tissue. Leukemia - cancer that starts in blood-forming tissue such as the bone marrow and causes large numbers of abnormal blood cells to be produced and enter the blood. Lymphoma and myeloma - cancers that begin in the cells of the immune system. Central nervous system cancers - cancers that begin in the tissues of the brain and spinal cord. Origins of cancer All cancers begin in cells, the body's basic unit of life. To understand cancer, it's helpful to know what happens when normal cells become cancer cells. The body is made up of many types of cells. These cells grow and divide in a controlled way to produce more cells as they are needed to ...
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Leukemia — Comprehensive overview covers symptoms, causes, risk factors, treatment of this blood-related cancer.
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