A1.2: Nucleic Acids

What provides evidence that all life on Earth evolved from the same population of cells?

• Eukaryotic cells evolved from prokaryotic cells.

• Both mitochondria and prokaryotes have a cell wall.

• Both eukaryotes and bacteria contain histones.

• The genetic code is universal.

Tags

NGSS.HS-LS4-1

A strand of nucleotides reads CCUAGAGCUUACCG. Which type of pentose sugar could be found in the nucleotides in the natural composition of this strand?

• Deoxyribose only

• Ribose only

• Neither deoxyribose nor ribose

• Both deoxyribose and ribose

Which statement is correct concerning the structure of DNA?

• A phosphate within a nucleotide is covalently bonded to a nitrogenous base

• DNA molecules are made up of two parallel strands running in the same 3'-5' direction, linked by hydrogen bonds between complementary bases

• Bonding between adjacent phosphates and deoxyribose sugars forms the backbone of DNA

• Adenine is complementary to uracil, and cytosine is complementary to guanine

What distinguishes uracil from thymine?

• A

• B

• C

• D

Which of the following represents the correct structure of RNA?

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• 
• 
•