Explain why three-base codons are needed and distinguish code degeneracy from its near universality.
Tę umiejętność sprawdza 7 zadań wzorowanych na arkuszach IB z lat 2022–2026.
Common cellular features coexist with the diversity produced by evolution. (a) Describe the roles of components shared across cellular organisms. (b) Discuss how separate populations can become distinct species. (c) Outline key features of the genetic code.
Which row demonstrates degeneracy of the genetic code? Row | mRNA codons | Encoded amino acids P | AAA GCU AAA | Lys–Ala–Lys Q | AUG UGG GAA | Met–Trp–Glu R | UCU GGA UCC | Ser–Gly–Ser S | UAC GAC AAC | Tyr–Asp–Asn A. P B. Q C. R D. S
What consequence follows from several codons specifying the same amino acid? A. Every codon specifies several amino acids B. Every substitution destroys a protein C. A ribosome can translate a codon without tRNA D. Some substitutions leave the amino-acid…
How many mRNA bases specify the amino acids in this model peptide? Count only bases in the amino-acid codons, excluding a stop codon and untranslated regions. A. 40 B. 80 C. 60 D. 20
Haemophilia can result from inadequate activity of a blood-clotting protein. (a) Outline how translation produces a polypeptide in a cell. (b) A woman carrying the usual X-linked recessive haemophilia allele has children with a man without that allele.…
A polypeptide contains 174 amino-acid residues. How many mRNA nucleotides specify these amino acids? Exclude untranslated regions and the stop codon. A. 58 B. 174 C. 348 D. 522
A short protein segment is compared across five hypothetical vertebrate species. Which statement is supported by the sequences? Position | 1 | 2 | 3 | 4 | 5 | 6 | 7 | 8 Species P | A | G | K | L | S | T | V | E Species Q | A | G | K | L | S | T | V | E Species…
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