QUESTION: 93

In the gear arrangement shown at the left, turning gear A will turn gear B in the direction marked with arrows.

Which of the following will cause gear B to turn more rapidly?

turning gear A more slowly
putting a gear of smaller diameter at B
using a much more dense metal in gear B than gear A
using gears that have an equal number of "teeth"
putting a gear of larger diameter at B

Answer(s): B

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Plant and animal cells have some structural differences. One of these differences is a rigid structure that helps support and protect plant cells. The diagram below shows a plant and an animal cell.

Wood, made up of plant cells, is a strong construction material. Based on the information and diagram, which structure enables plant cells to be used as construction material?

nucleus
cell wall
mitochondria
cytoplasm
cell membrane

Answer(s): B

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QUESTION: 95

-- Exhibit --
The carbon cycle is illustrated above. Two of the essential processes involved are photosynthesis in green plants and algae and respiration by almost all organisms. Respiration, as well as burning and other natural decomposition (breakdown) processes, contributes to the amount of CO2 in the air and soil. Photosynthesis uses up CO2 and produces O2, which, in turn, is used up in respiration and the burning of fossil fuels such as coal, oil, and gas.

-- Exhibit --
Based on the information and diagram, which process does not release CO2?

human respiration
burning fossil fuels
photosynthesis
animal respiration
auto exhaust

Answer(s): C

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QUESTION: 96

Maria bought a used desk at a yard sale. When she found a note dated May 1419 under the bottom of a drawer, she decided that the desk should undergo radioactive carbon dating to verify its age.
Who would most likely be qualified to do this type of study?

store manager
nuclear technician
auto mechanic
cabinetmaker
forester

Answer(s): B

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QUESTION: 96