Signal sequences (leaders sequences or signal peptides) are a. used to sort poly

Question

Signal sequences (leaders sequences or signal peptides) are a. used to sort polypeptide chains to the ER. b. used to sort polypeptide chains to the ribosome. c. used to initiate transcription. d. used to initiate translation The elongation of the leading strand during DNA synthesis a. occurs in 3 to 5' direction. b. occurs in a 5' to 3' direction. c. produces lagging strand fragments. d. does not require a template strand. Telomere sequences at the end of chromosomes a. protect critical genetic information from being lost following the gradual reduction in chromosome length that occurs with each replication cycle. b. initiate DNA replication. c. are required for sister chromatid separation. d. All of the above True or False. Only those proteins that are destined to be secreted from the cell are threaded into the ER. a. True b. False True or False. Oncogenes like the mutated ras gene which encodes a G protein, can promote cancer onset by effecting gene regulation. a. True b. False Which statement is true of a sister chromatid pair? a. Each chromatid of the pair is a distinct homologue. b. One of the chromatids in the pair is inherited from the paternal parent, and the other from the maternal parent. c. They are separated from each other during the process of mitosis. d. They are not separated from each other during the process of mitosis. What is a chromatid? a. A replicated chromosome b. A special region that holds two centromeres together c. DNA bound with histones d. None of the above

Explanation / Answer

25 ANS-A signal sequence (leader sequence or signal peptides )are used to short polypeptide chain to the ER

Signal polypeptide is a short is a short peptide present at the N terminus of the protein and resides in endoplasmic reticulum (ER) in a signal recognition particle (SRP)-dependent manner.

26 ans-B

the leading strand is synthesized in the direction of 5' to 3' towards the replication fork polynucleotide strand of DNA serves as a template to guide the synthesis of the new complementary polynucleotide of DNA.

27 ans-D

The main function of Telomeres is help to oranise of chromosomes in the nucleus ,its a repetitive nucleotide sequences(5'-TTAGGG-3' ) at each end of a eukaryotic chromosome, which protect the chromosome from degradation and allow the replication during cell divison.

28 ans-True

these proteins pass through the ER membrane and released into the luminal surface which are equivalent to the cells outer surface.

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