Which of the following statements best summarizes the differences between DNA and RNA?
A) DNA encodes hereditary information, whereas RNA does not.
B) The bases in DNA contain sugars, whereas the bases in RNA do not contain sugar.
C) DNA nucleotides contain a different sugar than RNA nucleotides.
D) DNA contains the base uracil, whereas RNA contains the base thymine.
C
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At an autosomal gene locus in humans, the allele for brown eyes is dominant over the allele for blue eyes. At another gene locus, located on the X chromosome, a recessive allele produces colorblindness while the dominant allele produces normal color vision. A heterozygous brown-eyed woman who is a carrier of colorblindness has a child with a blue-eyed man who is not colorblind. An ultrasound test shows that the child is a girl. What is the probability that she will be colorblind? (Enter the probability as a percent. Enter the number only without the percent sign. For example, enter 100% as 100 and enter 12.5% as 12.5)
What will be an ideal response? Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about X-linked and autosomal inheritance? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
Which one of the following would least likely be used during the initiation phase of translation?
A. elongation factors B. tRNA C. small ribosomal subunits D. initiation factors E. mRNA
What is the function of troponin in muscle contraction?
A. Troponin slides past myosin causing muscle shortening. B. Troponin forms the cross-bridges between actin and myosin. C. Troponin moves tropomyosin from actin so that the actin can bind to myosin. D. Troponin has no function in muscle contraction.
Why does blood move slower in the capillaries compared to the arterioles?
A. Precapillary sphincters close shunting blood into capillaries. B. Capillaries are present in muscles while arterioles are not. C. There are many more capillaries than arterioles. D. Blood pressure is much higher in capillaries than in arterioles. E. Capillaries are much wider than arterioles.