The Miller and Urey apparatus produced hydrogen cyanide (HCN), formaldehyde (CH2O), and glycine (an amino acid) in their first experiment, why was it important that they use water vapor, methane, carbon monoxide, ammonia and hydrogen as their reactants and an electrical spark as their energy source?
A. They knew these reactants were available in their lab and in today's atmosphere.
B. These reactants were found in today's atmosphere therefore they should be used to try to replicate the early Earth atmosphere.
C. Each of the reactants were readily changed into proteins and DNA.
D. These reactants were useful because their products were able to be predicted before the experiment began, it is always good to know the outcome of an experiment to achieve success with the experiment.
E. These reactants were hypothesized to have made up the early Earth atmosphere, the electricity was used to emulate lightening strikes.
E. These reactants were hypothesized to have made up the early Earth atmosphere, the electricity was used to emulate lightening strikes.
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The gizzard of a bird is important for which of the following activities?
A. mechanical breakdown of food B. chemical breakdown of carbohydrates C. chemical breakdown of proteins D. absorption of nutrients E. storage of food
The lateral line system in elasmobranchs is used to detect which of the following?
1.Electric currents 2.Odors 3.Sounds 4.Vibrations
Gregor Mendel performed his famous experiments on:
a) pigeons. b) hawkweed. c) humans. d) punnett squares. e) garden peas.
Identify the condition that will result in an increased level of calcium in the blood.
A. inhibition of chondrocytes B. excess osteocyte activity C. excess osteoblast activity D. inhibition of chondroblasts E. excess osteoclast activity Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? Gather Content · What do you know about bone metabolism and calcium? 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?