Who discovered that the structure of DNA is twisted like the strands of a rope? a. james watson b. rosalind franklin c. oswald avery d. francis crick
#2. What are bacteriophages?
a. units of heredity made up of DNA b. molecules that determine inheritance c. large molecules assembled from smaller, individual molecules d. tiny viruses that can invade and reproduce themselves in bacteria
#3. DNA is made of four different types of nucleotides. What are they?
A. Adenine, thymine, cytosine, and guanine
B. Adenine, 5 carbon sugar, phosphate, and cytosine
C. Thymine, 5 carbon sugar, phosphate, and guanine
D. Thymine, Cytosine, Phosphate, and guanine
#4. In a double helix, what holds the two DNA strands together?
A. A Hydrogen bond that forms between adenine and guanine
B. A hydrogen bond that forms between thymine and cytosine
C. Hydrogen bonds that form between adenine and guanine and between cytosine and guanine
D. Hydrogen bonds that form between adenine and thymine and between cytosine and guanine
#2. What are bacteriophages?
a. units of heredity made up of DNA b. molecules that determine inheritance c. large molecules assembled from smaller, individual molecules d. tiny viruses that can invade and reproduce themselves in bacteria
#3. DNA is made of four different types of nucleotides. What are they?
A. Adenine, thymine, cytosine, and guanine
B. Adenine, 5 carbon sugar, phosphate, and cytosine
C. Thymine, 5 carbon sugar, phosphate, and guanine
D. Thymine, Cytosine, Phosphate, and guanine
#4. In a double helix, what holds the two DNA strands together?
A. A Hydrogen bond that forms between adenine and guanine
B. A hydrogen bond that forms between thymine and cytosine
C. Hydrogen bonds that form between adenine and guanine and between cytosine and guanine
D. Hydrogen bonds that form between adenine and thymine and between cytosine and guanine