The nutritive tissue in a mature pine seed is triploid
____________________ Indicate whether the statement is true or false.
F, haploid
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You are asked to give a classroom demonstration of DNA supercoiling. To do so, you take two different colored pieces of rubber tubing, twist them very tightly and excessively around each other and join the ends of the tubing appropriately. Next, you relieve the supercoiling by breaking one strand and unwinding it. In this demonstration, the breaking and unwinding to relieve the supercoiling simulates the action of
A. exonucleases. B. polymerases. C. ligases. D. topoisomerases. E. primases. 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 supercoiling? 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?
Birds and crocodiles share which of the
following characteristics? a. ectothermy (body temperature regulated by environment) b. body hair c. four-chambered heart d. lung design e. light-weight bones
Why would gene duplication events, such as those seen in the Hox gene complex, set the stage for adaptive radiation?
A) There are more copies of genes, meaning speciation had occurred by polyploidy. B) The original gene copy is the outgroup, and the new gene copies are the adaptive radiation. C) Without duplicated genes, species would be vulnerable to extinction. D) One copy of a gene can perform the original function, while other copies are available to take on new functions.
What is the significance of buffers in biological systems?
A) They are usually involved in chemical reactions that result in energy production. B) They help maintain homeostasis with respect to pH. C) They are not present and are therefore insignificant in biological systems. D) They help maintain a constant temperature in biological systems.