IB Biology DNA structure review HL

Which type of bond is identified by the arrow?

• Phosphate

• Hydrogen

• Covalent

• Peptide

Tags

NGSS.HS-PS1-4

Which points to the 3′ end of a strand of DNA?

• I

• II

• III

• IV

The image shows a DNA nucleotide.

Which correctly identifies the parts labelled I and II?

• I phosphate; II base

• I ribose; II uracil

• I deoxyribose; II base

• I ribose; II base

Tags

NGSS.HS-LS1-1

What does a nucleosome consist of ?

• DNA and histones

• DNA and chromatin

• Chromatin and nucleotides

• Mature RNA and histones

Which of the following monomers are repeatedly joined together to form a strand of DNA?

• amino acids
• nucleotides
• fatty acids
• polysaccharides

In a molecule of double-stranded DNA, the amount of adenine present is always equal to the amount of _________.

• cytosine
• guanine
• thymine
• uracil

Which 2 molecules form the sides (backbone) of the DNA ladder?

• deoxyribose sugar and adenine
• deoxyribose sugar and a hydrogen bond
• deoxyribose sugar and the nucleus
• deoxyribose sugar and phosphate

The two strands of nitrogenous bases in DNA are joined by which type of bond?

• polar bonds
• ionic bonds
• covalent bonds
• hydrogen bonds

What are the three components of a nucleotide?

• sugar, hydrogen, nitrogen base
• sugar, oxygen, nitrogen base
• sugar, phosphate, nitrogen base
• sugar, phosphate, protein

Which bases are complimentary

• Adenine and Thymine

• Cytosine and Adenine

• Guanine and Thymine

• Cytosine and Guanine

• Adenine and Uracil