Stem cells have great potential to repair damaged tissues because they:
A) are small and can be engineered using biotechnology.
B) have the potential to develop into any type of cell in the body.
C) can be isolated from the blood and used to replace damaged or worn out cells.
D) contain special genes that allow them to divide and reproduce rapidly.
E) contain transgenic genes that have been engineered for specific tissue repair.
B) have the potential to develop into any type of cell in the body.
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In Drosophila, dosage compensation is controlled by the male-specific lethal (MSL) complex consisting of MSL proteins and roX RNAs. Based on what you know about dosage compensation, the role of the MSL complex in males would be to
A. double the level of expression of genes on the X chromosome. B. increase the level of expression of genes on the X chromosome by 50%. C. decrease the level of expression of genes on the X chromosome by 50%. D. decrease the level of expression of genes on the X chromosome by 100%. E. double the level of expression of genes on the Y chromosome. 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 dosage compensation? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
A physician discovered a cancerous tumor in the cartilage of a patient. What type of tumor is this?
A. myeloma B. retroviral C. sarcoma D. leukemia E. cyst
Which of the following would most likely
contain blood that needs to be cleansed?
a. the renal vein b. the renal artery c. the nephron d. all of these e. none of these
A positive serological test for tuberculosis indicates that the patient
A. is immune to tuberculosis. B. is an asymptomatic carrier of tuberculosis. C. has active tuberculosis. D. has been exposed to tuberculosis.