Which of the following bacterial hosts would should be used to avoid degradation of DNA that is introduced via a cloning vector?
A. Escherchia coli RecA mutants
B. Saccharomyces cerevisiae wild type cells
C. Escherichia coli that lack endonucleases
D. RecA-expressing Escherchia coli
Answer: C
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Lipopolysaccharides are a common class of T-dependent antigens.
Answer the following statement true (T) or false (F)
Are all mutations eventually eliminated by natural selection?
a. yes b. no
How are the nucleotide monomers connected to form a polynucleotide?
a. hydrogen bonds between complementary nitrogenous base pairs. b. ionic attractions between phosphate groups c. disulfide bridges between cysteine amino acids. d. covalent bonds between the sugar of one nucleotide and the phosphate of the next e. ester linkages between the carboxyl group of one nucleotide and the hydroxyl group on the ribose of the next
What occurs when a photosynthetic protist is taken up by a heterotrophic protist and evolves into a chloroplast?
A. Multicellularity B. Primary endosymbiosis C. Colonialism D. Chloroplasty E. Secondary endosymbiosis