Which Statement Is Correct

question 68

Multiple Choice

Which statement is correct?

• A) All cells from a single complex organism express the same genes.
• B) Mutations are always caused by chemicals or radiation.
• C) Mutations can occur spontaneously.
• D) Most mutations are harmful, so evolution proceeds more rapidly when no mutations occur.
• E) Mutations affect proteins but not the DNA.

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Definitions:

Detonation

An uncontrolled, explosive ignition of fuel within an engine's cylinder after the spark plug has fired, often causing engine damage.

Circuit

In electricity, a path for electrons to flow from a source of higher electrical potential to a source of lower potential.

Timing Belt

A belt that synchronizes the rotation of the engine's crankshaft and camshaft, ensuring that the valves open and close at correct intervals.

Relative Compression Test

A quick way to identify a weak cylinder by cranking the engine with an inductive ammeter on the starter circuit. With a lab scope, cranking amperage can be graphed and correlated to a particular cylinder. A cylinder with low compression will draw fewer amps than a cylinder with higher compression, which will show on the graph.