What are enhancers?
What will be an ideal response?
Enhancers are DNA sequences that typically have binding sites for several different activators and repressors. They are located somewhere in the vicinity of the gene, much farther away than promoter sequences, sometimes tens of kilobases away. They allow complex and nuanced control of gene expression depending on a number of different conditions such as developmental stage, tissue type, and response to extracellular signals.
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Which of the following diseases is NOT caused by an ascomycete?
A. apple scab B. wheat rust C. powdery mildew D. chestnut blight E. Dutch elm disease
This illustration shows
a. cytoplasmic division in an animal cell. b. a contractile ring mechanism. c. how chromosomes are dragged to the poles. d. cytoplasmic division in an animal cell and a contractile ring mechanism. e. cytoplasmic division in an animal cell and how chromosomes are dragged to the poles
Although the carrying capacity of a population is determined by food availability, what other factor affects the carrying capacity?
A) the energy fluctuations of the sun B) clean air and water C) the prevalence of war D) a woman's choice to not have children
Two important contributions that cleavage makes to development are to
A) establish the basic tissues of the body and define the future nervous system. B) create a multicellular embryo and partition the embryo into developmental regions. C) create a multicellular embryo and establish the basic tissues of the body. D) establish the basic body plan and determine the location of the mouth and anus.