Spliceosomes: a) are the size of an enzyme b) contain RNA and protein c) are pre
ID: 84960 • Letter: S
Question
Spliceosomes: a) are the size of an enzyme b) contain RNA and protein c) are present to add bases to RNA d) are present in bacteria The environment __________ influence expression of a genotype. a) can b) cannot Questions 23 and 24 refer to the following. Shown below are the complementation test results involving 4 independently isolated lethal mutants in a bacteriophage. Complementation was assayed by simultaneouly infecting bacteria with two phage strains, each with a different mutation, neither of which could alone lyse the cells. In the table below, a "+" indicates the strains complemented each other and therefore lysed open the bacteria. A "0" indicates no complementation and therefore no cell lysis occurred. Which mutants are in the same gene? a) 1, 2, 3 and 4 b) 1, 2 4 4 c) 1 & 2 d) 2 & 4 e) 1 & 3 How many genes are there? a) zero b) 1 c) 2 d) 3 e) 4 DNA ligase: a) adds nucleosides to a DNA strand b) cuts DNA forms a covalent bond in a sugar-phosphate backbone catalyzes hydrogen bonding adds supercoiling to DNA
Explanation / Answer
21. Spliceosomes is a large complex molecular machine, found inside the cell nucleus of eukaryotic cells, in there splicing speckles of the cell. This is basically works for breaking the premature RNA and make it active, so it is containing b) RNA and protein.
22. The environment can influence the expression of genotype.
23. The gene is best defined as an integral unit of genetic function, it is this shown here as through the complementation result that if two mutants from two different bacteriophage can complement each other, they can form a complemented product. Otherwise they are abortive, here from the four mutants we can see that d) 2 and 4 have got the complementation same with both 1 and 3. On the other hand 1 and 3 does not complement each other, also 2 and 3 complements so does 1 and 2. Finally it is evident that 1 and 4 can complement each other up and they are present in the same gene.
24. c) 2 genes are there.
25. DNA ligase: These are the useful molecules that helps in DNA replication process by joining lose nicks in the phosphodiester backbone of DNA. Biologically, they are essential for the joining of Okazaki fragments during replication. c) Forms a covalent bond in a sugar-phosphate backbone.
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