Genetics test review

The instructions for an organism's traits are coded in

• fat molecules in the cell membrane

• glucose units in carbohydrate molecules

• energy-rich bonds in starch molecules

• bases in DNA in the nucleus

The nitrogen bases found in DNA are represented by

the letters

• A, T, G, and C

• A, U, G, and C

• T, U, G, and C

• T, A, P, and C

DNA is a polymer consisting of repeating units

known as

• amino acids

• nucleotides

• dipeptides

• organic salts

Which of the following nucleic acids contains

thymine?

• Messenger RNA, only

• Transfer RNA, only

• DNA, messenger RNA, and transfer RNA

• DNA, only

Watson and Crick described the DNA molecule as a

• straight chain

• single strand

• double helix

• branching chain

The

diagram below which represents a portion of a DNA

molecule.

Structure Y represents

• a sugar

• a fat

• water

• protein

Structure X represents

• the base uracil

• a deoxyribose sugar

• a phosphate group

• a glucose sugar

The correct sequence of bases in strand II would be

• uracil, guanine, adenine, cytosine

• adenine, cytosine, guanine, thymine

• thymine, guanine, adenine, cytosine

• cytosine, adenine, guanine, uracil

The individuality of an organism is determined by the

• sequence of nitrogenous bases in

  deoxyribonucleic acid

• number of amino acids in a cell

• position of the ribosomes on the endoplasmic

  reticulum

• number of nitrogenous bases in a codon

Which scientists developed the double helix model

of the DNA molecule?

• Hardy and Weinberg

• Darwin and Lamarck

• Weismann and Miller

• Watson and Crick