Sister chromatid exchanges increase in frequency in the presence of X rays, certain viruses, ultraviolet light, and certain chemical mutagens. In what autosomal recessive disorder is there known to be an increase in sister chromatid exchanges?
What will be an ideal response?
Bloom syndrome
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If histones are extracted from DNA, what would remain?
A. DNA only B. DNA and tetranucleosomes C. DNA and chromosomal scaffolding proteins D. degraded segments of DNA
In general, litter with a C/N ratio greater than 30 leads to immobilization, litter with a C/N ratio less than 20 leads to mineralization, and litter with a C/N ratio of 20-30 leads to a balance of immobilization and mineralization resulting in no
net N production. If garlic mustard leaf litter collected on the forest floor had 43.2 percent C and 1.16 percent N, this tissue would lead to A) immobilization. B) mineralization. C) a balance of immobilization and mineralization. D) preferential consumption.
Exercise can trigger an asthma attack. This is especially true if someone goes for a long run on a cold morning. The two main causes of narrowing of the bronchiole passageways can be treated with drugs that act in different ways
What are the two causes of this narrowing, and how can drugs work to counteract these conditions?
Mosses and flowering plants differ in their dominant life cycle stages. Coleochaete is a multicellular algae that is considered to be the closest living relative of land plants. Coleochaete spend their entire life as a haploid organism. In what major way do these algae differ from mosses and flowering plants?
A. They do not undergo alternation of generations. B. They have a more prominent sporophyte generation. C. They do not undergo mitosis. D. They do not undergo photosynthesis.