Immediately inside the epidermis of a eudicot stem is the pith. Indicate whether the statement is true or false
False - cortex
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In 1910, Morgan did a series of experiments with the fruit fly Drosophila, an organism where females are XX and males are XY. When a mutant male fly with white eyes was crossed with a wild type female with red eyes, none of the F1 progeny had white eyes but 18% of the F2 progeny had white eyes. Unexpectedly, all of these white-eyed F2 flies were males. Based on these results, Morgan concluded that white eyes is caused by a recessive X-linked allele. Suppose Morgan had found that half of the F1 progeny had white eyes but all of these white-eyed F1 flies were females. In this case, a valid hypothesis would be
A. White eyes is caused by a recessive Y-linked allele. B. White eyes is caused by a dominant Y-linked allele. C. White eyes is caused by a dominant X-linked allele. D. White eyes is caused by a dominant autosomal allele. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about X-linked inheritance? Consider Possibilities · Consider the different answer options. Which can you rule out? 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?
Its defoliant effects were first noticed when it leaked from gas lights; later found to be produced by plants themselves.
Choose the letter of the best: A. abscisic acid B. auxin C. ethylene D. cytokinin E. gibberellin
Bacteria which move by means of gliding motility include
A) Cyanobacteria. B) Cytophaga. C) Clostridium. D) Spirillum. E) both Cyanobacteria and Cytophaga.
Several different classes of enzymes are needed for the catabolism of carbohydrates. Which of the following descriptions best matches the function of a dehydrogenase?
(a) An enzyme that catalyzes the rearrangement of bonds within a single molecule. (b) An enzyme that catalyzes a change in the position of a specific chemical group within a single molecule. (c) An enzyme that catalyzes the oxidation of a molecule by removing a hydride ion. (d) An enzyme that catalyzes the addition of phosphate groups to other molecules.