BIO 148 Exam Solved Questions Correct Detailed Answers Rated A+

BIO 148 Exam Solved Questions Correct Detailed Answers Rated A+ How many bases of mRNA would be used by a ribosome to synthesize a polypeptide with 3 amino acids? - Answer- 9 How many peptide bonds are in a polypeptide made up of 3 amino acids? - Answer- 2 Where is the R-group (side chain) located in an amino acid? - Answer- Bonded to the carbon, opposite the hydrogen If you compare any two different amino acids, how will they differ? a) their R groups will differ b) their amino groups will differ c) their carboxyl groups will differ d) A and B e) A, B, and C - Answer- a) their R groups will differ Genes: a) are traits b) are ribosomes c) are mRNAs d) code for proteins e) are made of proteins - Answer- d) code for proteins Two proteins with different amino acid sequences will have: a) different primary structures and different tertiary structures b) different primary structures and the same tertiary structures c) the same primary structures but different tertiary structures d) the same primary structures and the same tertiary structures - Answer- a) different primary structures and different tertiary structures All proteins: a) are synthesized on ribosomes b) are made of amino acids connected by peptide bonds c) have the same number of amino acids d) all of the above e) a and b only - Answer- e) a and b only What determines the tertiary structure of proteins? a) genes fold proteins into their correct tertiary structure b) genes determine the amino acid sequence of the protein, which determines its tertiary structure c) genes determine which ribosome synthesizes the protein, which determines its tertiary structure d) ribosomes fold polypeptides into their correct tertiary structure - Answer- b) genes determine the amino acid sequence of the protein, which determines its tertiary structure Which of the following is true concerning mRNA in eukaryotes? a) it is produced in the nucleus b) it contains untranslated sequences c) it is translated in the cytoplasm d) a and c e) a, b, and c - Answer- e) a, b, and c What process does the Central Dogma explain? a) how cells divide by mitosis b) how cells divide by meiosis c) how DNA is replicated d) how genetic information is expressed e) a and b - Answer- d) how genetic information is expressed Once transcription has initiated, which of the following would occur next? a) the primary transcript is processed b) the 5' UTR is transcribed c) mRNA is exported to the cytoplasm d) mRNA binds to the ribosome e) the start codon is translated - Answer- b) the 5' UTR is transcribed True or false? A mutation that does not change the DNA sequence of a gene can change the amino acid structure of a protein? - Answer- False A gene that codes for the BIO148 protein is expressed in the liver and in kidneys in an animal. An animal is born with a mutation that prevents the expression of the BIO148 protein in the kidney does not prevent its expression in liver. Where is this mutation most likely located? a) in the gene's promotor b) in a gene switch c) in the gene's intron d) in the gene's exon e) a or d - Answer- b) in a gene switch Which of the following is used by ribosomes during translation? a) mRNA b) DNA c) introns d) switches e) a and d are correct - Answer- a) mRNA Which of the following is translated? a) the promotor b) the 5' cap c) exons d) the +1 nucleotide e) both c and d are correct - Answer- c) exons Two distantly related species (like a cow and a yeast) will: a) have the exact same genes, just in different positions on the chromosome b) have the exact same genes, but different genes will be expressed in each species c) have many genes that differ between the two species d) share all the same genes, but may contain different alleles - Answer- c) have many genes that differ between the two species Two members of the same species will: a) have the exact same genes, just in different positions on the chromosomes b) have the exact same genes, but different genes will be expressed in each individual c) have many genes that differ between the two species d) share all the same genes, but may contain different alleles - Answer- d) share all the same genes, but may contain different allels An individual that is heterozygous for a particular gene has: a) two identical alleles of the gene, with each copy located on different non-homologous chromosomes b) two identical allele of the gene, with each copy located on homologous chromosomes c) two different alleles of the gene, with each copy located on different non-homologous chromosomes d) two different alleles of the gene, with each copy located on homologous chromosomes - Answer- d) two different alleles of the gene, with each copy located on homologous chromosomes Which of these descriptions correctly describes metaphase II of mitosis? a) cell is diploid, homologs pair b) cell is diploid, chromosomes line up in center c) cell is haploid, homologs pair d) cell is haploid, chromosomes line up in center e) cell is haploid, sister chromatids separate - Answer- d) cell is haploid, chromosomes line up in center