Which of the following is true of embryonic stem cells but not of adult stem cells?
A) They normally differentiate into only eggs and sperm.
B) They can give rise to all cell types in the organism.
C) They can continue to reproduce for an indefinite period.
D) One aim of using them is to provide cells for repair of diseased tissue.
B
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How can humans survive if they have an inactive gene that encodes a nonfunctional myosin protein?
A. We have over 40 closely related myosin genes. B. Myosin is not essential for life. C. Myosin participates in several processes in the cell. D. Other proteins in the body can do the same thing as myosin. E. Other primates have the same nonfunctional myosin protein and survive.
Briefly describe the three phases included in most evolutionary models for the preservation of duplicate genes, and the evolutionary processes involved
What will be an ideal response?
Govingee, 35 years old, has recently become lethargic, and his face feels very cool but puffy to the touch. When you take his pulse, you note that it seems abnormally low. What condition might Govingee have?
A) excess calcitonin B) accumulating aldosterone C) low thyroid hormone D) low growth hormone
Quorum sensing ________.
A. depends on the sensing of signal protein molecules B. plays an important role in formation of biofilms by Pseudomonas aeruginosa C. is a phenomenon in which bacteria monitor their own population density D. All of the choices are correct.