ANSI 3423 Exam Already Solved 100%

The condition resulting from a trisomy of chromosome 21 is - Answer Down syndrome During transcription, the synthesis of mRNA strand proceeds in which direction? - Answer 5' to 3' only Complementary base pairing allows for - Answer DNA to serve as its own template for replication The C value is the amount of DNA in a - Answer Haploid genome What signals the termination of translation? - Answer The ribosome reaches a stop codon The process by which genetic information is transferred from DNA to RNA is called - Answer Transcription Why is it that a carrot plant can express a bacterial gene? - Answer Because the genetic code is the same in both organisms After a region of DNA has been replicated, _____________ removes the RNA primers - Answer DNA polymerase I A peptide bond forms between the ____________ of one amino acid and the ___________ of another - Answer amino group; carboxyl group Which genetic disease(s) are caused by defective proteins that are not enzymes? - Answer Sickle-cell anemia and cystic fibrosis A person with sickle-cell trait has _____________ at the beta-globin locus - Answer One wild-type and one mutant allele What is a replication bubble? - Answer A locally denatured segment of DNA where replication originates During replication, the direction of synthesis of new DNA from the leading and lagging strands is - Answer 5' to 3' only As helicase unwinds the DNA molecule, what keeps the strands apart? - Answer Single-strand binding proteins Self-cleaving RNAs that function catalytically are called - Answer Ribozymes In eukaryotes, where does transcription take place? - Answer In the nucleus The sequence of bases of a molecule of mRNA is converted into a corresponding amino acid sequence during - Answer Translation How many replication forks are produced when DNA denatures at an origin? - Answer 2 What does a gene actually code for? - Answer A polypeptide What is the basic shape of a tRNA molecule? - Answer A three-dimensional cloverleaf In eukaryotes, chromosomes are duplicated during which stage of the cell cycle? - Answer S Which enzyme elongates the new DNA strand starting at an RNA primer? - Answer DNA polymerase III During the initiation step of transcription, what molecule binds the promoter region of a DNA molecule? - Answer RNA polymerase The single strand of mRNA that is produced during transcription has the same polarity as the __________ strand of DNA - Answer nontemplate After removal of the RNA primers and replacement with DNA nucleotides, the single-stranded nick adjacent to Okazaki fragments is filled in through a reaction that involves which enzyme? - Answer DNA ligase A monosomic cell would produce gametes with how many chromosomes? - Answer N and N-1 Cells obtained from a normal woman would contain ___________ Barr bodies - Answer 1 Turner syndrome individuals are - Answer Haploid Among Caucasians, the most common lethal autosomal recessive disease is - Answer Cystic fibrosis How many naturally occurring amino acids are used by ribosomes to construct proteins? - Answer 20 Which type of RNA is found only in eukaryotes? - Answer snRNA Which event occurs at the termination of transcription? - Answer -RNA polymerase is released from the DNA -RNA synthesis stops -The RNA chain is released from the DNA