Calvin Bridges, an associate of Thomas Hunt Morgan's, found further evidence that genes were located on chromosomes. Which of the following is not a component of his study?
A. He crossed white-eyed females (XwXw) with red-eyed males (XWY).
B. The F1 progeny were mostly the red-eyed males and white-eyed females expected.
C. A few rare white-eyed females and red-eyed males were observed, which he called primary exceptionals.
D. He proposed that the rare white-eyed females were the result of abnormal chromosome number.
E. Abnormal chromosome number was a result of nondisjunction in the female fly.
B
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Ossicles are found in
(a) the outer ear. (b) the middle ear. (c) the inner ear. (d) both a and c.
Which of the following things are made (in part) of carbon? Select all that apply
A. the shells of clams and other mollusks B. the glucose/sugars in fruits C. limestone at the bottom of the sea D. certain gases in the atmosphere
Research has shown that cytokinin levels fluctuate seasonally in temperate plants. What season would you expect to see the lowest levels of cytokinins and why would this be adaptive?
A. Spring, because lower levels of cytokinin allow auxin to promote rapid growth in stem height. This will allow the plant to compete effectively for sunlight. B. Summer, because lower levels of cytokinin would slow growth down and delay leaf aging. This will allow the plant to maximize the production of starch and increase it's sugar reserves. This will help ensure the plant's survival through Autumn and Winter. C. Autumn, because lower levels of cytokinin at this time of year will induce the production of ethylene. This will result in maturation of fruit and ensure effective seed dispersal before Winter. D. Winter, because lower levels of cytokinin will place buds into a dormant state. This will protect the underlying tissues from freezing until Spring. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about cytokinin levels and seasonality? How does it relate to the question? Consider Possibilities · What other information is related to the question? Which information is most useful? 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?
How does a competitive inhibitor slow enzyme catalysis?
a. They bind to the substrate. b. They compete with the substrate for the enzyme's active site. c. They produce products toxic to the enzymes. d. They degrade the substrate.