Which is NOT true of prokaryotes?
A) They contain ribosomes.
B) Their cells contain a true nucleus.
C) Their genes contain exons.
D) They include bacteria.
E) They are single-celled organisms.
B
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Four-year old Sammy is having a temper-tantrum. In a final attempt to get his way, he yells to his mom, “I'm gonna hold my breath ‘til I die!” What is the primary reason that Sammy’s mom is unconcerned by this statement?
A. It is impossible for Sammy to control the contraction of his diaphragm and intercostal muscles since they are made up of smooth muscle. B. As Sammy holds his breath, the decreasing levels of oxygen in his blood will lead to stimulation of the respiratory control center in his brain. C. Sammy is too young to hold his breath for more than 30 seconds. D. As Sammy holds his breath, the increasing levels of carbon dioxide in his blood will lead to stimulation of the respiratory control center in his brain. 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 respiration? 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?
To see in dim light, ____ are most needed
a. rods b. blue cones only c. green cones only d. red cones only e. both red and green cones
Which is NOT an example of a motor protein?
a. myosin b. dynein c. venosin d. kinesin
The first known multicellular organisms evolved approximately how many years ago?
A. 3.5 BYA B. 1.4 BYA C. 2.1 BYA D. 100 MYA