Question

1. The central dogma allows information flow in all of these directions EXCEPT (A) DNA to DNA (B) DNA to RNA (C) RNA to protein (D) Protein to DNA 2. The genetic code has all the following characteristics EXCEPT (A) The genetic code directs a specific amino acid to polypeptide (B) Five nucleotides comprise a codon (C) The genetic code is universal (D) The genetic code is conserved 3. Which description about restriction enzymes is true? (A) Recognize specific 4-8 bp (or longer) sequences (B) Cut only one DNA strand (C) Cut random DNA sequences (D) Can be used to seal broken DNA strands 4. Which of the following DNA elements promotes the assembly of the kinetochore? (A) ARS (B) TEL (C) CEN (D) OriC
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Answer #1

1. D. protein to RNA. central dogma model allows information transferred from DNA to RNA and then to PROTEIN . DNA can also be copied to DNA that process is called DNA replication.

2. B. five nucleotides comprise a codon.

three nucleotides comprise a codon.

3. D. can be used to seal broken DNA ends,

restrictio enzymes are used to cut dsDNA into fragments after recognizing specific nucleotide sequences known as restriction or recognition site.

DNA ligase enzyme is used to seal broken DNA strands.

4. CEN(centromeric sequence) is involved in assembly of kinetochore.

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