The process of morphogenesis in development begins ________ after fertilization
A) 3 weeks B) 20 weeks C) 12 weeks D) immediately
Answer: A
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Which of the following is not a feature of a bacterial artificial chromosome (BAC) vector?
A. CEN sequences B. origin of replication (ori) C. par genes D. selectable antibiotic resistance gene E. cloning site within the ?-galactosidase gene
Global deforestation remains a major concern as huge tracts of rainforest are cut down each day. How does the removal of such large numbers of trees from the world's forests affect the concentration of carbon dioxide in the atmosphere?
A. The concentration of carbon dioxide increases, which has a warming effect on the climate. B. The concentration of carbon dioxide increases, which has a cooling effect on the climate. C. The concentration of carbon dioxide decreases, which has a warming effect on the climate. D. The concentration of carbon dioxide decreases, which has a cooling effect on the climate. E. The concentration of carbon dioxide remains unchanged, with no effect on the climate.
Which of the following is/are the most immediate source of energy for cellular work?
a. glucose b. ATP c. glycogen.
In a population of frogs, RR homozygotes produce an average of 5 offspring that survive to reproduce. Rr frogs produce 4, and rr frogs produce 1. The fitness of the three genotypes w11, w12, and w22 are respectively
A) 5, 4, and 1. B) 0.5, 0.4, and 0.1. C) 1.0., 0.8, and 0.2. D) 0.5, 1.0, and 0.1. E) None of these