DNA structure and replication review

Where is DNA located?

• cell

• nucleus

• mitochondria

• cytoplasm

What do the letters DNA stand for?

• double stranded nucleic acid

• dioxide nitrogenous acid

• deoxyribonucleic acid

• double negative acid

When does DNA replication take place?

• mitosis

• meiosis

• S phase

• cell division

What is Chargaff's rule

• DNA always has equal numbers of each of the bases

• DNA strands are equivalent

• DNA in any cell in any organism always has a 1:1 ratio

• The adenosine and thymine bases are always equal in quantity, as are guanine and cysteine.

Which 2 scientists took diffraction x-ray photographs of DNA crystals to identify the double helix structure?

• James Watson and Frances Crick

• George Beadle and Edward Tatum

• Linus Pauling and Erwin Chargaff

• Rosalind Franklin and Maurice Wilkins

The three parts of a nucleotide are

• phosphate group, nucleotide base, ribose sugar

• phosphate group, hydrogen bond, bases

• phosphodiester bond, phosphate group, deoxyribose sugar

• DNA, chromosome, chromatin

Watson and Crick were the first to suggest that DNA is

• a short molecule

• a DNA molecule

• a double helix

• the genetic material

The bases have two different structures, they are

• purines and pyrimidines

• acids and bases

• helix and globular

• double and single bonded

What is the role of hydrogen bonds in DNA

• Unzips the 2 strands

• holds the ribose and phosphate groups together

• holds the bases together, joining the 2 strands

• holds amino acids together

The role of DNA helicase is to

• create complementary nucleotides

• unzips strands, breaking H bonds

• glues Okazaki fragments together

• coil the double helix up into the twisted form