Mitosis

During the replication of a DNA molecule, separation of “unzipping” of the DNA molecule will normally occur when hydrogen bonds are broken between:

• Thymine and thymine

• Cytosine and guanine

• Adenine and cytosine

• Guanine and uracil

The building blocks of both DNA and RNA molecules are known as

• Nucleotides

• Hydrocarbons

• Polysaccharides

• amino acids

The gene-chromosome theory includes the concept that

• Mutagenic agents rarely produce changes in genes

• Hereditary factors exist on chromosome

• External characteristics are not inherited

• Genes are made up of specific polysaccharides

The individuality of an organism is determined by the organism’s

• amino acids

• Nitrogenous bases

• DNA nucleotide sequence

• Transfer RNA molecules

The presence of DNA is important for cellular metabolic activities because DNA

• Is a structural component of cell walls

• Directly increases the solubility of nutrients

• Is the major component of cytoplasm

• Directs the production of enzymes

Which substances are components of a DNA nucleotide?

• Phosphate, ribose and adenine

• Phosphate, deoxyribose and uracil

• nucleotide, deoxyribose and phosphate

• Ribose, phosphate and uracil

The function of transfer RNA molecules is to

• Transport amino acids to messenger RNA

• Synthesize more transfer RNA molecules

• Transport amino acids to DNA in the nucleus

• Provide a template for the synthesis of messenger RNA

For the given phrase, choose the type of nucleic acid which is best described by the phrase:

Contains thymine instead of uracil

• mRNA

• tRNA

• DNA

• rRNA

Which molecules are composed of units known as nucleotides?

• Messenger RNA molecules only

• DNA molecules only

• Both RNA and DNA

• Transfer RNA molecules only

For the given phrase, choose the type of nucleic acid which is best described by the phrase: Carries genetic information from the cell nucleus to the ribosomes.

• mRNA

• tRNA

• DNA

• rRNA