1
Which of the following best describes a DNA molecule?
a. double helix
b. contains ribose
c. made of amino acids
d. contains Uracil
a. double helix
Which of the following units are repeatedly joined together to form a strand of DNA?
a. amino acids
b. nucleotides
c. fatty acids
d. polysaccharides
b. nucleotides
The sequence of DNA that would be complementary to this sequence....
ATG TGA CAG
TAC ACT GTC
Adenine bonds with ______________.
Thymine
Guanine bonds with ______________.
Cytosine
What are the 4 nitrogen bases in DNA?
adenine, thymine cytosine, and guanine
Which 2 molecules form the sides (backbone) of the DNA ladder?
deoxyribose and phosphate
Which organelle is DNA usually found in?
nucleus
Nucleotides are made up of a sugar, phosphate, and a _____.
nitrogenous base
Watson and Crick were the first to suggest that DNA is _____.
the shape of a double helix
What is the five carbon sugar found in RNA?
Ribose
A process in which DNA has the unique ability to make an exact copy of itself is called?
Replication
In nucleic acids, which type of bond links the 5-carbon sugars with an organic base?
Phosphodiester covalent bond
The two strands of a DNA double helix are held together by________.
hydrogen bonds
How did Rosalind Franklin's photo 51 affect the work of Watson and Crick?
It was used to determine the physical structure of DNA
What is the composition of the backbone of DNA?
Alternating sugar and phosphate molecules
What are the components of a DNA nucleotide?
Deoxyribose, a phosphate and one of the bases: adenine, cytosine, guanine or thymine
The sequence of nucleotides in a section of RNA is:
GCCAUACGAUCG
What is the base sequence of the DNA sense strand?
GCCATACGATCG
What does the universal nature of the genetic code allow?
Transfer of genes between species
What are genes?
Segments of DNA that relate to a certain trait
Identify three similarities between adenine and guanine.
both have two rings of atoms on their molecule;
both have one six-membered and one five-membered ring;
the nitrogen and carbon atoms are in the same places in the rings;
both are purine bases;
When is a genetic disorder created?
Results from mutations that usually harm the cells.
Which statement is correct concerning the structure of DNA?
A. A phosphate within a nucleotide is covalently bonded to a nitrogenous base
B. DNA molecules are made up of two parallel strands running in the same 3'-5' direction, linked by hydrogen bonds between complementary bases
C. Bonding between adjacent phosphates and deoxyribose sugars forms the backbone of DNA
D. Adenine is complementary to uracil, and cytosine is complementary to guanine
C. Bonding between adjacent phosphates and deoxyribose sugars forms the backbone of DNA
A strand of nucleotides reads CCUAGAGCUUACCG. Which type of pentose sugar could be found in the nucleotides in this strand?
A. Deoxyribose only
B. Ribose only
C. Both deoxyribose and ribose
D. Neither deoxyribose nor ribose
B. Ribose only
During DNA replication, what role does complementary base pairing play?
A. It ensures the genetic diversity of the replicated DNA
B. It stabilizes the double helix structure of DNA
C. It ensures the accuracy of the DNA copy
D. It accelerates the process of replication
C. It ensures the accuracy of the DNA copy