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7Sci Chapter 16 Sec1
Genes & DNA - What does DNA look like?
Question | Answer |
---|---|
What letters represent the four bases? | A, T, G, C |
Using x-ray diffraction, what did Rosalind Franklin show the shape of DNA to be? | a spiral |
What did Watson & Crick's DNA model look like? | a long, twisted ladder |
What are the sides of the DNA "ladder" made of? | sugar and phosphate |
What are the "rungs" of the DNA ladder? | a pair of bases |
When DNA is copied, where does the DNA molecule split? | down the middle |
DNA is made of subunits called what? | nucleotides |
What are nucleotides made of? | a sugar, a phosphate and a base |
Who discovered the amount of adenine in DNA always equals the amount of thymine? | Erwin Chargoff |
What scientist made images of DNA by using x-ray diffraction? | Rosalind Franklin |
What is the complementary strand to the DNA sequence TAGTCA? | ATCAGT |
Along with a sugar and a phosphate, what is the third part of a nucleotide? | a base |
What is the first step of DNA replication? | a strand of DNA splits down the middle |
Whose research indicated that the bases in DNA must match with each other in some regular pattern? | Erin Chagraff |
Who stated that the amount of cytosine in DNA is always equal to the amount of guanine? | Erin Chagraff |
What are the subunits in DNA composed of? | nucleotides |
Why do the pairs of bases match up? | because they are complimentary |
What does the pairing of bases allow cells to do? | replicate |
What base fits together with adenine? | thymine |
What base fits together with cytosine? | guanine |
The sides of the DNA ladder are formed in part by what? | phosphate |
How often is DNA copied? | every time a cell divides |
What are the four types of nucleotides? | adenine, thymine, guanine and cytosine |
What is DNA? | the material that makes up genes and is found in all cells. |
What does the statement "DNA unites all organisms" mean? | DNA is found in the cells of the entire variety of organisms on Earth. |
What happens after a DNA strand splits down the middle for replication? | New nucleotides attach to the exposed bases of both sides, and two identical strands of DNA are formed. |
What is another name for deoxyribonucleic acid? | DNA |