What are histones, and how are they arranged in nucleosomes?
What will be an ideal response?
Histones include five main classes of relatively small basic proteins containing relatively large amounts of lysine and arginine. Nucleosomes are made of two each of four types of histones.
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Tails that have equally sized upper and lower lobes are called:
a. heterocercal. b. ganoid. c. cycloid. d. homocercal. e. ctenoid.
Scientists studying the causes of a type of progressive hearing loss known as otosclerosis want to identify the genetic contribution to the disorder. By which of the following are they most likely to find a causative gene or genes?
A) a genome-wide association study with a large number of SNPs, using pooled DNA samples B) genome-wide linkage analysis studies of families whose members have otosclerosis C) a candidate gene case-control association study with genes known to be involved in ear development D) comparison of gene expression among otosclerosis patients E) allelic heterogeneity studies for a gene expected to be involved
What happens during an allergic reaction?
A) Immune cells attack the body's healthy cells. B) The body mounts an immune reaction to a harmless substance. C) Substances that were previously harmless become pathogenic. D) The immune system overreacts to a mild pathogen.
Auxin stimulates leaf release, while ethylene keeps leaves from falling.
Answer the following statement true (T) or false (F)