Cells that produce antibodies and provide future immunity against similar pathogens are
A) mast cells.
B) natural killer cells.
C) T cells.
D) dendritic cells.
E) B cells.
E
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Transcription factors generally "read" DNA sequences through amino acid–nucleotide contacts in the major groove because:
A. there are no minor groove hydrogen bond acceptors available at A–T base pairs. B. the minor groove displays only methyl functional groups for recognition. C. there are more hydrogen bond donors and acceptors in the major groove. D. all minor groove functional groups are the same.
Answer the following statements true (T) or false (F)
1. Because they differ from other living organisms by lacking a discrete nucleus and many other cell inclusions, bacteria and archaea are more closely related to one another than they are to eukaryotes. 2. Archaea that tolerate and/or require high salinities are called halophiles. 3. Various anaerobic archaea that convert carbon dioxide and other carbon-bearing compounds into methane are called methanotrophs. 4. Type IV secretion systems are potentially applicable to treatment of human disease by using them to deliver DNA to target cells in human gene therapy.
Once a macrophage engulfs a bacterium, what happens to the foreign cell?
A) It is released into the lymph system for removal from the body. B) It is released into the digestive tract for removal from the body. C) The macrophage is attacked by antibodies, killing the cell and bacterium. D) Antibodies penetrate the macrophage to lyse the bacterial cell. E) The bacterium is killed by digestive enzymes released from lysosomes.
Bacteria residing in the large intestine release ________, which is absorbed by the human host and used for the process of blood clotting
Fill in the blank(s) with correct word