Download dna ppt ques – ANSWERS2

Name______________
Period______________
Date________________
Powerpoint Questions
1. . The DNA structure was discovered by the scientists
___WATSON______ & ____CRICK______ in what year?
____1953_______
2. The structure of DNA is in the shape of _A TWISTED
LADDER OR
STAIRCASE___________________________________________________.
3. We call it the __DOUBLE HELIX___________________________.
4. The sides of the ladder are composed of _____A SUGAR
(DEOXYRIBOSE) AND A PHOSPHATE
MOLECULE____________________________________________________
_________________________________________________________________
_________.
5. The rungs of the ladder are composed of the nitrogen
bases_________ADENINE, THYMINE, GUANINE, AND
CYTOSINE__________________________________________.
6. Adenine always pairs with ___THYMINE____________.
7. Guanine always pairs with _____CYTOSINE___________.
8. Replication. When DNA replicates it must go through a few
steps:
1. The two sides __UNWIND OR
UNZIP_________________________________.
2. The nitrogen bases that are __FLOATING___________ in
the nucleus will _____HOOK UP________________ with the
now one sided DNA.
3. The new copy will be ____AN EXACT COPY OF THE
ORIGINAL________________________.
9. Order of the bases from a _____CODE___ that specifies what
type of [PROTEIN___________ will be made.
10.
Pairings of three letters code for _AN AMINO
ACID_____________________.
11.
Amino acids hook together like __BEADS ON A
NECKLACE____________________ to make a protein.
12.
How does the DNA message get to the ribosome when
DNA is too big to fit out of the nucleus???? ____A
MESSENGER!_________________________.
13.
RNA is a lot like DNA, but it has only ___ONE______
strand instead of Two, so it is ___SKINNIER_____________ and
can fit out of the ________NUCLEUS_____.
14.
RNA has the same nitrogen bases as DNA except it
does not have ___THYMINE______________, it has
__URACIL_______ instead. So A pairs with _U___ in RNA.
15.
Messenger RNA (mRNA) - takes the
___MESSAGE________ about what type of _PROTEIN_______ to
make out of the nucleus to the ___RIBOSOME____________.
16.
Transfer RNA (tRNA) takes the amino acids (___SMALL
PARTS THAT MAKE UP
PROTEINS________________________________________________) to
the ribosome and adds them to the __GROWING PROTEIN
(NECKLACE)________________.
17.
Protein Synthesis (Making Proteins)
1, DNA unzips and a RNA_________ strand pairs up with the
DNA strand (G pairs with C, but A pairs with ___U______
because there is no __THYMINE_______ in RNA.
2. The mRNA then leaves the ___NUCLEUS_________ and
attaches itself to a __RIBOSOME_______________ and passes
on the ___MESSAGE__________.
3. The tRNA then attaches to ___MRNA_______ and hooks up
the ____AMINO ACIDS___ in the right order. Then it goes
back to pick up some __MORE________(like a _TAXI
CAB_____________ picking up more people).
4. The amino acids get strung along into a
___NECKLACE__________ and when it is complete you have a
________PROTEIN___________.
18.
Mutations. A change or mistake in a gene is called a
_______MUTATION____________. This may cause an incorrect
protein to be made which will cause a different
__TRAIT______ than intended in the __ORGANISM______.
19.
Sometimes mutations do not affect the organism
_____EITHER WAY__________.
20.
Sometimes they can be ______HELPFUL_________ - Like
____________________A BACTERIA BEING RESISTANT TO
ANTIBIOTICS___________________________________________.
21.
Sometimes they can be ____HARMFUL____, like
______________AN ALBINO BUNNY IN THE
FOREST__________________________________________________.