Each codon (except for stop codons) corresponds for a specific: a. Protein b. Su

Question

Each codon (except for stop codons) corresponds for a specific: a. Protein b. Sugar c. Amino acid d. Nucleotide c. Polypeptide Which of the following statements is true? a. X chromosomes have genes for many characters related 10 sex, whereas Y chromosome mainly encodes genes related to sex determination b. X chromosomes have genes for many characters related to sex, whereas Y chromosome mainly encodes genes unrelated to sex determination. c. X chromosomes have genes for many characters unrelated to sex. whereas Y chromosome mainly encodes genes unrelated to sex determination d. X chromosomes have genes for many characters unrelated to sex, whereas Y chromosome mainly encodes genes related to sex determination e. None of the above Ribozymes cleave a. Ribosomes b. Enzymes c. Ribose d. Ribosomal proteins e. mRNA The number of distinct proteins found in eukaryotes can exceed the total number of genes. This is largely due to: a. Protein stability b. Alternative splicing c. Mutation d. Homologous genes e. Protein degradation If the percent recombination between A and B is 12, between A and C is 4, and between B and C is 8, then the order of the genes on the chromosome is: a. A - B - C b. B - A - C C. A - C - B d. C - B - A e. None of the above The trp repressor blocks transcription of the trp operon when the repressor ______. a. Binds to tryptophan b. Binds to the inducer c. Is not bound to tryptophan d. Is not bound to the operator e. None of the above

Explanation / Answer

Answer:

(6) c

Each codon or triplet sequence in DNA encodes for a particular amino acid. Out of 64 codons present, 61 encode for amino acids and 3 act as stop codon.

(7) d

The X chromosome is longer in size compared to the Y chromosome and contains many genes which are unrelated to sex. Most Y chromosome genes help determine sex.

(8) e

Ribozymes are involved in cleaving mRNA, for example in splicing reactions. The ribozyme cleaves in between mRNA sequence to discard the introns and exons are ligated together.

(9) b

Alternative splicing is a post transcriptional regulatory process that enables a single gene encode for multiple proteins. This is achieved by including or excluding exons during the final processed mRNA.

(10) c

From the above data, the map distance between A and B is 12, that is maximum. So, A and B lie the farthest. For A and C, the distance is 4 (C is located nearer to A than B). Therefore, the sequence stands to: A-C-B.

(11) a

Trp operon is an operon in E.coli that is reponsible for encoding enzymes involved in trp synthesis. When trp repressor is bound to trp, it blocks transcription of trp operon.

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