You are given an experimental problem involving control of a gene's expression in the embryo of a particular species. One of your first questions is whether the gene's expression is controlled at the level of transcription or translation. Which of the following might best give you an answer?
a) You use an antibiotic known to prevent translation.
b) You measure the quantity of the appropriate pre-mRNA in various cell types and find they are all the same.
c) An analysis of amino acid production by the cell shows you that there is an increase at this stage of embryonic life.
d) You assess the position and sequence of the promoter and enhancer for this gene.
e) You explore whether there has been alternative splicing by examining amino acid sequences of very similar proteins.
Answer: b) You measure the quantity of the appropriate pre-mRNA in various cell types and find they are all the same.
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DNA double helices are soluble in water but insoluble in alcohol. How do these physical properties reflect the chemical structure of the DNA molecule?
A) The charged phosphate groups and sugars of DNA are hydrophilic. B) The purine and pyrimidine bases are hydrophilic. C) The 5 prime to 3 prime polarity of DNA makes it soluble in water but not in alcohol. D) The charged R-groups of DNA are hydrophilic.
A doctor’s office has run out of the latest flu vaccine, but many patients are asking for it. One of the nurses finds some vials from last year’s batch in a refrigerator. Should they be used?
A. Yes, because the preservatives and refrigeration ensure that the vaccine is still fresh. B. No, because each year the technology to make a good vaccine improves. C. No, because each year the vaccine is made against different subtypes of the flu virus. D. Maybe – the vaccine should be mixed in a test tube with the virus to see if it still inactivates it. 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 the flu virus? 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?
All the processes that lead to the death of a plant or
any of its organs are a. dormancy. b. vernalization. c. abscission. d. senescence. e. none of these.
The pulmonary artery carries blood away from the following structures?
a) aorta b) right atrium c) right ventricle d) left atrium e) left ventricle