In vertebrates and plants, what types of modifications to the N-terminal tails of histones lead to heterochromatin formation?
What will be an ideal response?
deacetylation and methylation
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Which of the following statements is false?
a. Cytotoxic T cells kill body cells that have been invaded by pathogens. b. The cell-mediated response is ineffective against a pathogen that has already entered the cytoplasm of a body cell. c. Cytotoxic T cells are produced by the bone marrow but mature in the thymus gland. d. Cytotoxic T cells are unable to destroy freefloating viruses they encounter in the bloodstream. e. Cytotoxic T cells secrete perforins that are able to punch holes in infected cells.
In organogenesis, the ectoderm gives rise to:
a. muscle. b. the digestive tract. c. sense organs. d. the circulatory system. e. skeletal tissue.
A common source of DNA for forensic testing is
A) the skin between the toes. B) cells scraped from inside the cheek. C) red blood cells. D) mucus.
Certain drugs prevent the formation of a hydrogen ion gradient across the inner mitochondrial membrane. What is the most likely consequence?
A) Most ATP production will stop, and the cell will die. B) ATP production will increase. C) Fermentation will stop. D) Glycolysis will stop.