QUESTION: 125

Scientists are unraveling the mystery of how early life-forms were first able to duplicate themselves. Today, it is known that reproduction and growth requires both DNA and proteins. DNA holds the crucial genetic instructions for assembling amino acids into proteins. Proteins are key molecules that make up the structure of future generations. Precisely, how does this process occur? RNA seems to hold the key to an answer.
Which statement provides the best summation about the duplication of life-forms presented above?

Investigating questions of origin is an artist's function, not that of a scientist.
Questions of origin are best resolved legislatively, by a vote among scientists.
RNA may be involved in linking protein synthesis with DNA.
DNA is a small, very simple molecule.
Research studies should concentrate on copying protein molecules to form other protein molecules.

Answer(s): C

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QUESTION: 126

Which conclusion is best supported by the graph?
Exhibit:

Exhibit

The taller the tree, the smaller the diameter.
The shorter the tree, the bigger the diameter.
The taller the tree, the bigger the diameter.
As a tree's height increases, its diameter increases, but only for the first year.
The tree's height and diameter are not related at all.

Answer(s): C

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QUESTION: 127

The diagram of the upper arm shows the human biceps and triceps muscles, with the biceps labeled "A" and the triceps "B".

Based on the diagram, which movement would cause muscle A (biceps) to contract fully?

lifting a book from a desk to one's shoulder
touching one's toes
dialing the telephone
writing a note
turning a doorknob

Answer(s): A

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QUESTION: 128

Atoms in gases are in constant motion and in constant collision with each other. When atoms of A and B collide, they react to form a product P.

What is the effect of increasing pressure on the gases?

an increase in P
a decrease in P
an increase in A
an increase in B
no change in A, B, or P

Answer(s): A

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QUESTION: 128