Unit: DNA and Protein Synthesis

What was Marshall Nirenberg and Heinrich Matthaei’s contribution to our current understanding of the genetic code?

• discovery of codons

• discovery and extraction of DNA

• creation of a model of DNA

• creation of Photo 51

According to Chargaff's rule, base pairing in DNA should resemble which of the following?

• A = T; C = G

• A = C; T = G

• A = G; T = C

• A = U; C = G

Rosalind Franklin is famous for which contribution to the study of DNA?

• creation of an accurate model of DNA structure

• creation of an X-ray diffraction image of DNA structure

• identification of a pattern in ratios of DNA bases

• dentification of DNA in bandages that contained pus

If the same base pairs are used to code for all organisms, why is there so much variation among organisms?

• The order of the codons differs between organisms.

• The order of the codons is the same between organisms.

• The codons in each organism are the same.

• The codons in each organism differ.

What is one benefit of mapping the human genome?

• locating the chromosomal abnormalities that cause disease

• having the genomes of every living individual on file

• choosing the gender or intellectual ability of an unborn child

• cloning the individuals that comprise a nearly extinct tribe

In 1953, who developed the model that is shown below?

• James Watson and Francis Crick

• Marshall Nirenberg and Heinrich Matthaei

• Rosalind Franklin

• Erwin Chargaff

Which of the following incorrectly matches the term with its location?

• DNA is found in a chromosome.

• Chromosomes are found in the nucleus of a cell.

• Genes are located in a nucleotide.

• Nitrogen bases are located in the central rungs of a DNA ladder.

Who is credited with creating the first accurate model of DNA?

• Rosalind Franklin

• Friedrich Miescher

• James Watson and Francis Crick

• Marshall Nirenberg and Heinrich Matthaei

Which bases are found in a strand of DNA?

• thymine, guanine, cytosine, uracil

• guanine, cytosine, uracil, adenine

• cytosine, glycine, adenine, thymine

• adenine, thymine, guanine, cytosine

Which term describes the chromosomal abnormality of having extra chromosomes?

• heterosomy

• polysomy

• haploidy

• diploidy