Quick using all my points 1.in dna replication, the helix is opened and unwound by the enzyme dna a) polymerase b) deoxase c) ligase d) helicase 2. when dna separates into two strands, the dna would most likely be directly involved in a) evolution b) fertilization c) differentiation d) replication 3. if a dna molecule is 22% adenine in any organism, which percentage of thymine will that dna molecule contain? a) 44% b) 22% c) 56% d) 28% 4. what is the complementary base of adenine in dna? a) cytosine b) uracil c) guanine d) thymine 5. what is the complementary base of adenine in dna? a) cytosine b) uracil c) guanine d) thymine 6. genes code for specifically structured a) lipids. b) sugars. c) proteins. d) acids. 7. which biomolecules are found in all organisms? a) chlorophyll, chitin, pepsin, glycogen b) glucose, maltose, fructose, sucrose c) adenine, cytosine, thymine, guanine d) cholesterol, phospholipid, cellulose, gibberellin

Answer 1: Option D, helicase

Helicase is the enzyme which opens up the DNA strands so that DNA polymerase could bind, and then start the replication process.

Answer 2: Option D, replication

Separating of DNA strands takes place in replication, where copies of DNA strands are made.

Answer 3: Option B, 22%

According the rules of Chargaff, the amount of adenine and thymine is same in the DNA. This is because they are complementary pair of the DNA. So their amount would remain same.

Answer 4 and 5: Option D, thymine

Chargaff gave the information about the complementary pairs in DNA and RNA. Adenine pairs with Thymine in DNA and with uracil in RNA.

Answer 6: Option C, proteins

DNA is a code for the proteins. It contains codons for amino acids and helps in formation of peptide chains.

Answer 7: Option C

These are all nitrogen bases, which are present in DNA and RNA of all organisms.

b - the respond is innate and varies over time.

good luck!