35. What substance associates with proteins to form ribosomes in the cytoplasm?

Question

35. What substance associates with proteins to form ribosomes in the cytoplasm? (A) DNA (B) tRNA (C) rRNA (D) mRNA 36. Breeding two closely related organisms to have desired traits is callecd (A) hybridization. (C) genetic engineering. (B) inbreeding. (D) performing a test cross. 37. Some bacteria contain proteins that cut DNA molecules at specific DNA base sequences. These are called (A) restriction enzymes. (B) plasmids. (C) ribosomes. (D) zygotes. 38._ The total DNA present in the nucleus of each cell of an organism is its (A) clone. (B) Okazaki fragment. (C) haplotype. (D) genome. Match the scientists with their contributions to DNA theory by writing the correct letter on the appropriate blank line. A. P.A. Levene . James Watson and Francis Crick .Erwin Chargaff B. Kary Mullis . Alfred Hershey and Martha Chase F. Rosalind Franklin . Oswald Avery . George Beadle and Edward Tatum . Frederick Griffith 39. Discovered that one strain of bacteria could be transformed into another. Discovered that the amount of A was equal to the amount of T and that the amount of C was equal to the amount of G in any given species' DNA. 40, 41.Discovered the basic structure of DNA nucleotides. 4. Took Photo 51, which revealed that DNA could be a double heli Took Photo 51, which revealed that DNA could be a double helix. Used radioactively labeled sulfur and phosphorus to trace DNA and protein. Developed what was known as the "one gene-one enzyme" hypothesis (now the 43. 44. "one gene-one polypeptide" hypothesis). 45. Discovered the structure of DNA.

Explanation / Answer

Ans 35) b) rRNA or Ribosomal RNA – The rRNA binds together with the proteins and forms the ribosomes in the cytoplasm. The ribosome is the site for protein synthesis.

Ans 36) b) Inbreeding – This is a process where there is production of the offspring from breeding on individuals or organisms that are genetically related to each other. It increases the homozygosity.

Ans 37) (a) Restriction enzymes – They are proteins which are produced by some bacteria which helps in cleaving the DNA molecules. They cleave the DNA molecules near or at specific sequence of bases.

Ans 38) d) Genome – It is the complete set of genes or genetic material which is present in the nucleus of the cell.

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