BIOLOGY Test 1
DNA & Replication
Khan Academy Video Title: DNA Structure and Replication
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1. DNA is known as ______________________ _____________.
2. DNA stores our genetic instructions and programs our cell ___________________.
3. Every human cell contains _____ chromosomes, with each containing ___ big DNA molecule.
4. DNA and RNA are ___________________ ___________.
5. Nucleic acids are polymers made up of smaller repeating units, in the case of DNA, these are called ___________________.
6. What are the 3 parts of a nucleotide?
a) ___________________
b) ___________________ group
c) 1 of 4 ___________________ bases
7. The 5 carbon sugar is called ____________________.
8. List the 4 nitrogenous bases:
a) ___________________
b) ___________________
c) ___________________
d) ___________________
9. The sugars and phosphate bond together to form the ___________________ of DNA.
10. DNA runs in a ____ to ____ direction, with the oxygen from deoxyribose pointing to the ____ end.
11. The only counterpart for adenine is ___________________, while cytosine can only bond with ___________________.
12. Give the matching base sequence for the following DNA strand:
5' A G G T C C G 3'
13. RNA is similar to DNA, but there are 3 major differences:
a) RNA is ___________________ stranded
b) Sugar is ___________________, not deoxyribose
c) No thymine, ___________________ instead
14. Rosalind ___________________ used x-ray diffraction to find the structure of DNA.
15. Cells constantly divide and that requires a _______________of DNA information.
16. ___________________ is the process of copying DNA.
Process of Replication:
17. The enzyme ___________________ unzips the DNA double helix.
18. Another enzyme called __________ ___________________ adds matching nucleotides onto the main strand.
19. ________ ___________________ is an enzyme that gives DNA polymerase a starting point.
20. DNA replication gets it wrong in about 1 in 10 ___________________ nucleotides.
21. DNA polymerase can ______________ _____________ the strand and find the mistakes.
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