Scientific evidences suggest that oxygen gas
appeared on earth about ____ years ago.
a. 38,000,000,000
b. 25,000,000,000
c. 2,300,000,000
d. 380,000,000
e. 4,500,000
C
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To become bound to hemoglobin for transport in a mammal, atmospheric molecules of oxygen must cross _____
A) zero membranesâ€"oxygen binds directly to hemoglobin, a protein dissolved in the plasma of the blood B) one membraneâ€"that of the lining in the lungsâ€"and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood C) two membranesâ€"in and out of the cell lining the lungâ€"and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood D) four membranesâ€"in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillaryâ€"and then bind directly to hemoglobin, a protein dissolved in the plasma of the blood E) five membranesâ€"in and out of the cell lining the lung, in and out of the endothelial cell lining an alveolar capillary, and into the red blood cellâ€"to bind with hemoglobin
If you are tossing a six-sided die, what is the probability of getting either a 1 or a 2 on your first toss AND a 1 or a 2 on your second toss?
A. 1/18 B. 1/9 C. 1/6 D. 1/3 E. 2/3 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 probability? 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?
The chief function of root hairs is to
A) decrease the anchoring power of roots. B) increase the surface area for efficient absorption of water and minerals. C) provide a direct passageway from the soil to the vascular cylinder.
In the chemical sodium chloride, the positively charged sodium and negatively charged chlorine atoms are held together by a(n) _____ bond.
A. ionic
B. covalent
C. hydrogen