3. Which of following codons would not be recognized as a stop coden for
translation?
(A) AUG;
(B) UĄG;
(C) UAA;
(D) UGA;
(E) none of the choices are correct.

4. Which of following sequences is a palindrome?(A) GAATTC; (B) CTGACT; (C) ATCCTC; (D) GGCCAA; (E) CCTTTC

5. All of the following descriptions is gene participates in activities conditions except (A) A gene is repository of genetic information; (B) A gene can be replicated; (C) A gene can accept occasional changes, or mutation; (D) Genes are fixed in their position on a chromosome. (E) Genes could also be turned on or off due to certain environmental conditions.

6. Which of following descriptions is not correct for transcription? (A) DNA as a template; (B) Four ribonucleoside triphosphates as subtracts; (C) DNA polymerase as enzyme; (D) Phosphodiester bond in the product chain; (E) the product growing chain in 5' to 3' direction.

7. Which of following descriptions is not correct? (A) The prokaryotic mRNA have a special sequence, called a Shine-Dalgarno sequence; (B) A protein called the cap-binding protein binds to the cap and then helps attract ribosome at eukaryotic mRNAs; (C) The initiation codon interacts with a special aminoacyl-tRNA is N-formylmethionyl-tRNA in eukaryote; (D) The enzyme call aminoacyl-tRNA synthetase that play a specific amino acid attach to a specific tRNA; (E) The tRNA contains a 3-bp sequence that pairs with a complementary 3-bp sequence in an mRNA.

8. The cDNA is (A) circular DNA; (B) complementary DNA; (C) central DNA; (D) cloned DNA; (E) cut DNA.

9. All of the following items are biological macromolecules except(A) Protein; (B) Carbohydrate; (C) Nucleic acid; (D) Fats; (E) Vitamin

10. Which of following descriptions is not correct for Mendel's laws of inheritance?(A) One allele can be dominant over the other, recessive, allele; (B) If each parentcarries two copies of a gene, the parents are diploid for that gene; (C) A gene can existin different forms called alleles; (D) An organism that has two identical alleles for agene is said to be homozygous for that gene; (E) Sex cells, or gametes, are haploid,containing two copies of each gene.

11. Which of the following techniques is most useful to amplify a specific DNA fragment in vitro? (A) Southern analysis; (B) DNA fingerprinting; (C) Polymerase chain reaction; (D) DNA sequencing; (E) RACE

12.β-galactosidase cleaves the disaccharide lactose into _______and_______.(A) glucose, galactose; (B) glucose, fructose; (C) galactose, fructose; (D) galactose, galactose. (E) glucose, glucose.

13. Which of the following statements is not true about the λ phage?(A) DNA circularization in E.coli by 12 base cos cohesive ends; (B) The product of clgene is a repressor, which is important for lysogeny; (C) The expression of cro genemust be stimulated during lysogeny; (D) cIII is a protector of cII; (E) N and Q genesmust be turn on during lytic phase.

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