OpenStax Biology: Chapter 15 Genes and Proteins

The AUC and AUA codons in mRNA both specify isoleucine. What feature of the genetic code explains this?

• complementarity
• nonsense codons
• universality
• degeneracy

How many nucleotides are in 12 mRNA codons?

• 12
• 24
• 36
• 48

In any given species, there are at least how many types of tRNA's?

• 20

• 40

• 100

• 200

The RNA components of ribosomes are synthesized in the ________.

• cytoplasm

• nucleus

• nucleolus

• endoplasmic reticulum

Which pre-mRNA processing step is important for recognition by the small ribosomal subunit?

• 3' poly-A tail

• telomeres

• splicing

• 5' 7-methylguanosine cap

What is the predicted size of the corresponding mature mRNA in base pairs (bp)? (excluding the 5’ cap and 3’ poly-A tail)

• 220bp

• 295bp

• 140bp

• 435bp

Which sequence of DNA bases would pair with this partial strand

ATG TGA CAG

• ATG TGA CAG

• TAC ACT GTC

• GTA AGT GAC

• CAT TCA CTG

How does RNA differ from DNA?

• RNA contains uracil and deoxyribose
• RNA contains ribose and thymine
• RNA contains uracil and ribose
• RNA contains adenine and ribose

The process of making proteins on the ribosome based on instructions from messenger RNA is called

• transcription
• transformation
• translation
• molecular biology

Changes is DNA sequences that affect genetic information are known as

• replications
• mutations
• transformations
• translations

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