E) one of the above 14 in Griffith\'s 1928 expeniment demonstrating bacterial tr
ID: 198194 • Letter: E
Question
E) one of the above 14 in Griffith's 1928 expeniment demonstrating bacterial transformation mice, injection of live R bacteria resulted in cell components and live R bacteria resulted in injection of live S bacteria resulted in A) live; dead; live B) dead, live; live C) dead, live:; dead D) dead, dead, dead E) dead; dead, live 1s in assembling a nucleosome, normally the 1) histone dimers first combine to form a tetramer. further combines with two .. .(2) histone dimers to form the octamer A. 1:H1-H3; 2: H2A-H28 B. 1: H3-H4;2: H2A-H28 C. 1: H2A-H28; 2: H1-H3 D. 1: H2A-H2B, 2: H3-H4 E. 1: H1-H2; 2: H3-H4 16 The chromatin remodeling complexes play an important role in chromatin regulation in the nucleus. They. A. can slide nucleosomes on DNA 8. have ATPase activity. C. interact with histone chaperones D. can remove or exchange core histone subunits. E. All of the above 17 Nucleosomes that are positioned like beads on a string over a region of DNA can interact to form higher orders of chromatin structure. Which of the following factors can contribute to the formation of the 30-nm chromatin fiber from these nucleosomes? A. Interactions that involve the histone tails of neighboring nucleosomes Interaction of the linker histone H1 with each nucleosome B. C. Binding of proteins to DNA or the histones D. ATP-dependent function of chromatin remodeling complexes E. All of the above Which of the following processes that happens inside a cell DOES NOT normally require consumption of free energy by the cell? 18 a. b. c. d. e. Replication of the genetic material Import of nutrients from the environment Diffusion of small molecules within the cell Regulation of gene expression Synthesis of enzymes that catalyze cellular reactions 19 Which of the following would you NOT expect to find in a bacterial cell? a) Swimming using flagella b) Having a cell wall around the plasma membrane c) ATP production in mitochondria d) Protein production on the ribosome e) Sexual exchange of DNA with other bacteriaExplanation / Answer
14.
Injection of live S strain bacteria results in Dead mice. While injection of live R strain bacteria results in live mice. Simultaneous injection of live R and heat killed S strain bacteria results in Dead mice.
15.
In nucleosome assembly, usually H3-H4 histone dimers first combine to form a tetramer, which then combines with two H2A-H2B histone dimers to form an octamer
16.
Chromatin remodelling complex has ATPase activity, can remove or add core histone subunits, can interact with histone chaperone, and can slide nucleosomes on DNA.
17.
30nm chromatin structure is formed by the combined effect of various factors like ineraction of linker histone H1 with the nucleosomes, the interactions of histone tails of neighbouring nucleosomes, binding of protiens to DNA and histones and ATP dependant function of chromatin remodelling complex.
18.
Diffusion is the net passive movement of particles (atoms, ions or molecules) from a region of higher concentration to regions of lower concentration. As this is a passive transport, it doesnt require the consumption of free energy by the cell.
19.
Bacteria lacks cellular organelle including mitochondria. So the energy requiremens of bacteria is me though glycolysis and by generating a proton gradient across their cell membranes.
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