Which arthropod subgroup includes animals with six legs?
A. Crustaceans
B. Arachnids
C. Insects
D. All of the above include animals with six legs
Answer: C
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A researcher wants to create a mouse model for a disease, to allow her team to study possible therapies. The disease is known to be caused by a small deletion that removes a certain gene. Which type of mouse would be the best choice for this purpose?
A. Knockout mouse B. Knockin mouse C. Conditional knockout mouse activated by a drug D. Mutant derived by traditional forward genetics screen E. Tissue-specific gene knockout Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you already know about transgenic mouse technology? 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?
Leptin works to reduce weight gain by
a. preventing absorption of fat by the small intestine. b. suppressing the urge to eat. c. making fat less soluble. d. stimulating the conversion of fat cells into skeletal muscle cells. e. stimulating the increased production of acid in the stomach that more thoroughly breaks down fatty acids
Expression of a shortened skin keratin gene in place of the normal keratin gene in transgenic mice resulted in a phenotype in which mice had
a. thick skin. b. no hair. c. fragile, easily blistered skin. d. white hair. e. Both b and c
Which of the following would a biologist describe as microevolution?
A) the formation of new species B) the extinction of species C) dramatic biological changes, such as the origin of flight, within a taxon D) a change in the gene pool of a population from one generation to the next