DNA Structure DOK 2 and 3

What happens to the DNA helix when a cell reproduces?

• It partially dissolves in the cytoplasm

• It unzips and makes a copy of itself

• It forms a vesicle until division is complete

• It forms a plasmid and doubles in size

If nitrogenous bases of DNA were connect with strong covalent bonds, how might DNA replication be effected?

• The process would require less energy to break and reform bonds

• The process would take longer because the bases would only separate in one place

• The bases would not come apart easily, making it difficult to read the sequence

• The bases would not fit around the histones, making longer chromosomes

A student compared DNA replication to making a photocopy of a document. Which statement is the BEST description?

• Both create a mirror image of the original, but in DNA replication the original is consumed to create the copies.

• Both result in an exact copy being created, but photocopying the original is broken down by the process

• Both result in an exact copy being created, but in DNA replication one half of the original becomes part of the copy

• Both create a mirror image of the original, but in photocopying multiple copies can be made at one time.

What is the relationship between proteins and nucleic acids?

• Nucleic acids encode and transmit genetic information which is used to make proteins

• Proteins are produced by the mitochondria that are made up of nucleic acids

• Proteins compose the nucleic acids that store genetic information

• Nucleic acids are the basic units that compose proteins in the cell

Which images represent pyrimidines? (two answers)

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• 
• 
• 

Which images represent purines? (two answers)

• 
• 
• 
• 

Which statement about DNA structure is correct?

• The two strands are identical and run in the same direction. 
• The two sides are identical and run in opposite direction. 
• The two sides are complementary and run in the same direction.
• The two sides are complementary and run in opposite direction.  

What is the primary function of DNA?

• To determine the sequence of amino acids in a protein molecule

• To determine the sequence of saccharide monomers in a polysaccharide molecule

• To determine the sequence of traits in an individual

• To determine the sequence of fatty acids in a glycerol molecule

Tags

NGSS.HS-LS1-1

The work of Erwin Chargaff allowed Watson and Crick to determine the rules of.......

• protein synthesis

• transcription

• hydrogen bonding

• nitrogenous base pairing

Tags

NGSS.HS-LS1-1

How many rings do pyrimidine bases have?

• 1
• 2
• 3
• 4