Download Ch6.1 - Cobb Learning

Chapter 6 Section 1
_________________ always equals the amount of thymine.
11.According to Chargaff’s rules, the amount of guanine always
Section: What Does DNA Look Like?
equals the amount of _______________________.
______ 1. What are chromosomes made of?
12. Rosalind Franklin used a process known as
a.inherited characteristics c.cells and structures
_______________________ to make images of DNA
b. generations
molecules.
d.protein and DN
______ 2. What is the name of the material that determines
inherited characteristics?
13. What shape did Franklin’s images show?
_______________________________________
a.deoxyribonucleic acid
c. RNA
14. What did James Watson and Francis Crick’s model of DNA
look like?
b.ribosome
d. amino acid
_______________________________________
THE PIECES OF THE PUZZLE
_______________________________________
3. The subunits that make up DNA are called
a. phosphates.
c.
amino acids.
b. nucleotides.
d. bases.
15. What two things did this model eventually help explain?
_______________________________________
_______________________________________
4. What two things must DNA be able to do?
_________________________________________
DNA’S DOUBLE STRUCTURE
_________________________________________
16. The twisted ladder shape of DNA is called a(n)
__________________________
5.Why must DNA be able to be copied?
_______________________________________
17.What molecules form the sides of the ladder?
_______________________________________
6.Scientists were surprised about how much the DNA molecule
_______________________________________
_______________________________________
could
do,
because
_______________________
they
thought
molecules
could
instructions and be copied during cell division.
only
give
18. What are the rungs of the DNA ladder made of?
_______________________________________
Match the correct description with the correct term. Write the
7.What three things is a nucleotide made of?
letter in the space provided.
_______________________________________
_______________________________________
_______ 19. pairs with adenine
_______ 20. pairs with guanine
a. cytosine
b. thymine
8.What are the four bases of a nucleotide?
_______________________________________
21.How did the double helix structure match Chargaff’s
observations?
9. What four letters stand for the four types of bases?
_______________________________________
______________________________________
_______________________________________
_______________________________________
10. According to Chargaff’s rules, the amount of
MAKING COPIES OF DNA
5.Nucleotide base known as G:
22. The pairing of bases allows the cell to
______________________, or make copies of DNA.
6. Complement of base in question 5:
23. Both sides of a DNA molecule are
______________________, binding only with their match.
24.Where is a molecule split during replication?
7.
Organelle that makes proteins:
_______________________________________
25.After a DNA molecule splits, what is added to each side of
the ladder?
8. A molecule that helps build new proteins by copying DNA:
_______________________________________
9.Changes in the number, type, or order of DNA bases:
26.How often is DNA copied?
______________________________________________________________________________
10.Analysis of fragments of DNA as a form of identification
(two words):
27.What in the cell helps with unwinding, copying, and
rewinding the DNA?
________________________________________
VOCABULARY ACTIVITY: Unraveling Genes
After you finish reading the chapter, try this puzzle!
11.Genes are located in these bundles that are found in the
nucleus of most cells:
Solve the clues and unscramble the letters to fill in the
blanks. Then read the final clue and fill in the boxes to
unravel the secret message.
1. Molecule that carries our hereditary information:
2.
12. Genetic engineering may repair or change:
Subunit of DNA:
13.The shape Rosalind Franklin uncovered with her X-ray
diffraction and Watson and Crick memorialized in a model:
3. Nucleotide base known as A:
4. Complement of base in question 3: