Describe how nucleosomes may influence gene transcription
What will be an ideal response?
The binding of transcription factors requires accessing nucleosomal DNA, and such factors may displace nucleosomes. The removal of a nucleosome from a stretch of DNA exposes it to binding by transcription factors and RNA polymerase, allowing transcription to proceed.
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An immunoassay was developed to rapidly diagnose patients infected with an emerging virus. However, the researchers discovered that some individuals were producing false negatives when tested, despite being infected with the virus. What might explain this?
A. Rapid evolution of the viral antigen B. Changes in the length of the viral DNA C. Number of genome copies carried in each virion D. Changes in the antibody produced by the virus Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about immunoassays? Choose Answer · Given what you now know, what information and/or problem solving approach is most likely to produce the correct answer? Reflect on Process · Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Sudden nutrient perturbations in an environment generally ________ the overall prokaryotic diversity
A) increase B) decrease C) maintain D) replicate
Which of the following describe an aspect of epistasis?
_____ A situation where a single character is controlled by more than one gene. _____ A phenomenon where one gene masks the expression of another gene. _____ A pattern of inheritance in which modification of a gene during gamete formation permanently affects the phenotype of the individual. _____ A situation where one gene controls the expression of more than one character.
The water-vascular system is used primarily for
a. excretion of excess water. b. locomotion. c. respiration. d. circulation. e. sensing the environment.