Farmers often spray spores of which bacterial species that make a protein toxic only to some insect larvae?
A. Aspergillus niger
B. Proteobacteria
C. Verticillium
D. Agrobacterium tumefaciens
E. Bacillus thuringiensis
Answer: E
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Which statement about gene therapy is false?
A) It has been used to treat some genetic disorders, such as severe combined immunodeficiency disease (SCID). B) It works to treat diseases by inserting a functional gene into an individual's cells to replace a defective version. C) It is performed on cells of the body, which ensures that a defective gene cannot be passed on to offspring. D) It may cause difficulty regulating gene expression. E) It is not totally effective because there are difficulties getting the functional gene into the target cells.
You observe two female fish of the same species breeding. One female lays 100 eggs and the other female lays 1000 eggs. Which one of the following is LEAST likely given the limits of fitness trade-offs?
A) The female laying 100 eggs breeds more often than the female laying 1000 eggs. B) The female laying 100 eggs lives longer than the female laying 1000 eggs. C) The eggs from the female laying 1000 eggs have larger yolks than the yolks of the eggs from the female laying 100 eggs. D) The female laying 1000 eggs is larger than the female laying 100 eggs.
Foods such as acidic fruits are often spoiled by
A. fungi. B. protozoans. C. viruses. D. bacteria.
Which is most likely to happen to a human polyploid?
a. natural abortion b. death around the age of 1 year c. survival until the early teens d. survival until the mid-thirties e. death around the age of 1 month