What nitrogenous bases are found in a molecule of RNA (ribonucleic acid)?
A) adenine, guanine, thymine, and uracil
B) uracil, adenine, guanine, and adenosine
C) thymine, adenine, guanine, and cytosine
D) adenine, guanine, cytosine, and uracil
D
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It can be very difficult to select an angle for sneaking up to a grasshopper to catch it because grasshoppers have _____
A) excellent hearing for detecting predators B) compound eyes with multiple ommatidia C) eyes with multiple fovea D) a camera-like eye with multiple fovea E) binocular vision
Each species in a community has its own __________, or way of living. Fill in the blank(s) with the appropriate word(s)
Which of the following best explains why herbivorous organisms are more energetically efficient than those that consume meat?
a. herbivorous organisms are slower and therefore burn fewer calories b. herbivorous organisms obtain their energy directly from the sun c. herbivorous organisms are at the top of the food chain d. herbivorous organisms need to consume less food than meat eaters to obtain the same amount of energy e. herbivorous organisms are at the bottom of the food chain
What is the leading scientific hypothesis explaining how the endomembrane system of eukaryotic cells originated?
A) From the inward folding of the plasma membrane B) From engulfing prokaryotic cells C) From engulfing eukaryotic cells D) From the spontaneous coalescence of phospholipids