DNA Sony In the living world there are millions of different kinds of (1)
How are these made by cells? It has been found that
protein synthesis in a cell is controlled by a complex
macromolecule called (2) This compound is not a
protein but a (3) A nucleic acid is made up of 3
parts. A 5-Carbon (4) molecule, nitrogen containing
(5), and a (6) group. DNA looks like a ladder
twisted into a shape known as (7). Each side of the
"ladder" is a long strand made of connecting nucleic acids.
Each base is joined by a weak (8). to a base on the other
strand forming "rungs" in the ladder. The bases form
complementary pairs. Adenine bonds with (9)
cytosine bonds with (10). During DNA (11) the
hydrogen bonds break and each strand finds new
complimentary bases.

some sources quote the lethal dose, for an average 170lbs opiate-naive individual is between 75 and 375 mg

substituting a hydrogen atom with a halogen in a hydrocarbon:

- the single bond remains single. a is wrong.

- the bond with hydrogen is as strong as with a halogen. c is wrong

- a hydrocarbon is saturated if there is no double bond. we do not know that so d is wrong.

- carbon will always have four valence electrons. e is wrong.

by elimination, the correct answer is b. the boiling point of the new compound increases.

chemical changes occur when a substance combines with another to form a new substance, called chemical synthesis or, alternatively, chemical decomposition into two or more different substances. these processes are called chemical reactions and, in general, are not reversible except by further chemical reactions. some reactions produce heat and are called exothermic reactions and others may require heat to enable the reaction to occur, which are called endothermic reactions. understanding chemical changes is a major part of the science of chemistry.

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