Starting with shredded spinach leaves, you follow a procedure that allows for separation of cellular organelles. You are specifically looking for the fraction that contains the mitochondria. To identify this fraction, you should test for the
A) phospholipids unique to intracellular membranes.
B) general presence of enzymes that fix carbon.
C) phospholipids unique to the mitochondrial membrane.
D) polysaccharides that specifically surround the mitochondria.
E) presence of enzymes associated with cellular respiration.
E) presence of enzymes associated with cellular respiration.
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Coadaptation occurs when two or more species interact closely in the same ecological setting
Indicate whether the statement is true or false.
Which type of connective tissue forms tendons and ligaments?
a. loose connective tissue b. blood c. cartilage d. fibrous connective tissue e. adipose tissue
Sea turtles are endangered, in part because of human encroachment on the beaches where they lay eggs. You are working with a team to help protect turtle nests and hatchlings from curious beachgoers. Someone suggests putting a fabric dome over each nest to keep people away. What is your response?
A. "That will have several benefits, including protecting the nests from rough weather and hurricanes." B. "That would create a new problem if it blocked the females, since the females sit on the nests to keep them warm." C. "That might create a new problem. Sea turtles use temperature-dependent sex determination, and lowering the temperature of the nest will likely change the sex ratio of the hatchlings." D. "That would create a new problem if it blocked the males. The males have to be able to dig into the nest to fertilize the eggs." 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 turtle development? What other information is related to the question? Choose Answer Given what you now know, what information 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?
Radioactive isotopes have
a. excess electrons. b. excess protons. c. excess neutrons. d. insufficient neutrons. e. insufficient protons