Unit 5 Review

Which defines a codon?

• a protein that begins transcription by breaking apart hydrogen bonds
• a free-floating nucleotide that attaches to an open DNA strand
• the genetic “code word” of three nitrogen bases on mRNA that specify one amino acid
• the strong bond between two complementary nitrogen bases

Below is a list of nitrogenous bases found in DNA and RNA. Which of the nitrogenous bases are present in DNA? Choose the BEST answer.

• I, III
• II, III, IV, V
• I, II, IV, V
• I, II, III, IV

What part of DNA is responsible for coding your traits, referred to as the genetic code?

• Phosphates
• Nitrogen bases
• Deoxyribose sugars
• Ribose sugars

The surface of the nucleus holds tiny pores that allow small, single-stranded molecules to pass through. This is one reason why only _____________ can leave the nucleus during the process of protein synthesis.

• DNA
• Proteins
• tRNA
• mRNA

Which processes occurs in the nucleus?

• 1 and 2
• 2 and 3
• 3 and 4
• 4 and 5

Process 2 is known as

• Replication
• Mutation
• Transcription
• Translation

What is the complementary mRNA sequence for the DNA sequence: 3' A-C-T-T-C-G-A 5'

• 5’ T-G-A-A-G-C-T 3’
• 3’ U-G-A-A-G-C-U 5’
• 5’ U-G-A-A-G-C-U 3’
• 3’ T-G-A-A-G-C-T 5’

This diagram shows which cellular process?

• Replication
• Transcription
• Translation
• Mutation

The site of translation is the

• Nucleus
• Mitochondria
• Chloroplast
• Ribosome

Some events that take place during the synthesis of a specific protein are listed below. What is the correct order of events?

• ii, v, i, iii, iv
• iv, i, v, iii, ii
• ii, i, v, iv, iii
• iii, ii, i, v, iv