QUESTION 47 Plasmids a. are self-reproducing circular molecules of DNA O b. are

Question

QUESTION 47 Plasmids a. are self-reproducing circular molecules of DNA O b. are sites for inserting genes for amplification c. may be transferred between different species of bacteria o d. all of these QUESTION 48 The type of Archaebacteria most likley to be found in a swamp is a. thermophilic b. halophilic c. cyanobacteria o d. methanogens e. E.coli QUESTION 49 Cell part responsible for maintaining cell shape, internal organization, and cell movements is the a. vesicle. b. nucleus c. endoplasmic reticulum. d. cytoskeleton. e. ribosome. QUESTION 50 are reactions by which cells acquire and use energy to grow, survive, and reproduce (o) a. metabolism b. homeostasis c. inheritance o d. experiment

Explanation / Answer

Answer (Q. 47): (d) all of these

Explanation

Plasmids are the self-replicating circular DNA molecules that are used most commonly in the field of recombinant DNA technology have been optimized for their use of studying and manipulating genes. For instance, most plasmids are replicated in E. coli and are relatively small (3000 - 6000 basepairs) to enable easy manipulation. Typically, plasmids contain the minimum essential DNA sequences for this purpose, which includes a DNA replication origin, an antibiotic-resistance gene, and a region in which exogenous DNA fragments can be inserted.

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