The first chemicals that provided potential energy on Earth may have been formaldehyde and hydrogen cyanide. While these were produced by sunlight-driven reactions, they also occurred around deep-sea vents. If the first organisms on Earth evolved around
these vents, the first life on Earth was _____.
A) photosynthetic, obtaining energy from the Sun
B) chemosynthetic, obtaining energy from chemicals
C) herbivorous, obtaining energy from plants
D) carnivorous, obtaining energy from animals
Answer: B
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The digestive system of molluscs is found in the:
a. head. b. foot. c. mantle. d. visceral mass. e. mantle cavity.
Four of the five answers listed below are
endocrine glands. Select the EXCEPTION.
a. thymus gland b. salivary gland c. parathyroid gland d. thyroid gland e. pituitary gland
When NADH or NADPH transfers electrons to a recipient molecule, the recipient becomes reduced and the activated carries are oxidized (NAD+ or NADP+, respectively). What else happens during this reaction?
A.) a phosphate group is transferred to the recipient molecule B.) a proton is take up by the carrier C.) a proton is released into the solution D.) a proton is taken up by the recipient molecule E.) a molecule of water is released into the solution
Which of the following is not a difference between the human skeleton and the chimpanzee skeleton?
A. The human spine is S-shaped, while the ape spine has a slight curve. B. The ribs attach to the vertebral column in humans, but are free-floating in apes. C. The human foot has an arch, while the ape foot does not. D. The human femur angles inward to the knees, while the ape femur angles out a bit. E. The human knee can support more weight than the ape knee.