1. Who were the first scientists to describe DNA as a double helix structure? A.
ID: 6911 • Letter: 1
Question
1. Who were the first scientists to describe DNA as a double helix structure?A. Rutherford and Crick
B.Mandeleev and Watson
C.Watson and Crick
D.Watson and Rutherford
2.Which of the following is not a sub-unit of a nucleotide?
A. phosphoric acid
B. a phosphorus-containing base
C. the sugar deoxyribose or ribose
D. all of the above are units that make up a nucleotide
3.ATP is composed of all but the following ____
A. a ribose 5-sided sugar
B. adenine
C. three phosphate groups
D. thymine
4.How does ATP release energy to drive chemical reactions in the cell?
A. the last two phosphate bonds are unstable and easily broken, releasing large amounts of energy
B. the last phosphate bond is hydrolyzed
C. ATP is changed to ADP and reused later
D. all of the above are correct
5.What base is found in RNA but not DNA?
A. adenine
B. cytosine
C. thymine
D.uracil
Explanation / Answer
1. C 2. A 3. Adenosine Triphosphate. (Thymine is not in the formula) D 4. I'm not really sure about this one, but I'm sure that A is correct. 5. D
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