Which nitrogenous bases are considered pyrimidines?
a. adenine and guanine
b. thymine and adenine
c. adenine and cytosine
d. thymine and cytosine
Answer: d. thymine and cytosine
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Which statement is true?
a. The ratio of carbon dioxide produced to oxygen consumed is greater than one in healthy adults. b. The partial pressure of oxygen in the lungs is greatest just before exhalation. c. The partial pressure of carbon dioxide is greatest in venous blood. d. Partial pressures are the measurement of Hg displacement in the lungs.
Some bacteria avoid being phagocytized by a host's immune system by means of:
a. ameboid motion. b. their capsule or slime layer. c. efficient use of their flagella. d. changing their cell wall structure. e. eliminating the use of a membrane
This figure shows the geological history of North and South America and the closing of the Isthmus of Panama
If a single species were distributed throughout the region indicated by the arrow in the left-most panel, and today is found as two separate species, one in the Atlantic Ocean and one in the Pacific, would this be more likely to be an example of allopatric speciation by the dumbbell model or the peripheral isolate model? Why? What will be an ideal response?
What is a major similarity and difference between photorespiration and aerobic respiration?
What will be an ideal response?