Transient microbiota differ from normal microbiota in that transient microbiota
A) cause diseases.
B) are found in a certain location on the host.
C) are always acquired by direct contact.
D) are present for a relatively short time.
E) never cause disease.
D
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Acetate is the starting point for synthesis of a cell's ____
Fill in the blank with the appropriate word.
Many men make antibodies to sperm, resulting in destruction of sperm to the point of sterility. What would be the likely origin of this autoimmune disease?
A. These antibodies are produced as a result of mutations in T lymphocytes, causing them to make large amounts of antibody. B. Antigens on sperm cells are similar to antigens on a variety of bacteria like Streptococcus. After a strep throat caused by Streptococcus, the immune system produces antibodies to streptococcal antigens, which then cross react with sperm antigens and destroy them. C. Since sperm are not made until after puberty, the immune system cannot scan the antigens on the sperm for immune tolerance. After sperm are made and the immune system sees them, they are recognized as foreign. D. T helper cells erroneously identify sperm cells as foreign invaders, triggering the T cytotoxic cells to start killing sperm.
Name the indicated structure in this image of a bird embryo
1.amniotic cavity
2.allantois
3.chorion
4.yolk
A coefficient of coincidence of zero is the same as an interference value of zero
Indicate whether the statement is true or false