BIOS 100 Chapter 7 - a) amino acids. b)monosaccharides. c)phospholip...

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BIOS 100 Chapter 7

• Double helix of DNA The double helix of DNA is composed of building blocks called
• amino acids.

b)monosaccharides.c)phospholipids.d)disaccharides.

e)nucleotides.:

Answer e)nucleotides.

• Rungs of the DNA ladder The rungs of the DNA ladder are formed by base pairs
• joined by covalent bonds.
• joined by hydrogen bonds.
• joined by ionic bonds.

d) NOT joined to each other.:

Answer b) joined by hydrogen bonds.

• Base pairing in DNA In DNA molecules,
• cytosine pairs with adenine.
• thymine pairs with uracil.
• adenine pairs with uracil.
• adenine pairs with thymine.

e) cytosine pairs with thymine.:

Answer d)adenine pairs with thymine.

• The Central Dogma The "Central Dogma" of molecular biology described by Watson and

Crick describes

• the passing of genetic information from DNA to RNA by translation.
• the passing of genetic information from RNA to protein by transcription.
• the inheritance of traits between generations.
• the production of energy in a cell.

e) the directional flow of genetic information in cells.:

Answer e)the directional flow of genetic information in cells.

• RNA differs from DNA RNA differs from DNA in many ways, including

a) DNA contains deoxyribose and RNA contains ribose.

b) DNA contains thymine and RNA contains uracil instead of thymine. 1 / 2

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c) All are correct.

d) DNA is double stranded and RNA is single stranded.

e9RNA can catalyze some chemical reactions and DNA cannot.:

Answer c)All are cor- rect.

• DNA differs from RNA DNA differs from RNA because, unlike RNA,

a) DNA contains uracil.

b) DNA contains thymine.

c) DNA can catalyze some chemical reactions.

d) DNA is single stranded.

e) DNA contains ribose.:

Answer b) DNA contains thymine.

• Carries information for protein What type of RNA carries the information that specifies a

protein?

• transfer RNA
• b)ribosomal RNA

c)messenger RNA d)double-stranded RNA

e)complementary RNA:

Answer c)messenger RNA

• Carries amino acids to ribosome What type of RNA carries amino acids to

the ribosome? complementary RNA

• messenger RNA b)ribosomal RNA
• c)double-stranded RNA

d) transfer RNA:

Answer d)transfer RNA

• Start of gene A DNA sequence that signals the start of a gene is
• a codon.
• an anticodon.
• a terminator.
• a promoter.

e) an amino acid attachment site.:

Answer d)a promoter.

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