B cells differentiate into plasma cells, which produce antibodies
Indicate whether the statement is true or false.
T
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Which of the following is the correct sequence during the alternation of generations life cycle in a flowering plant?
A) sporophyte ? meiosis ? gametophyte ? gametes ? fertilization ? diploid zygote B) sporophyte ? mitosis ? gametophyte ? meiosis ? sporophyte C) haploid gametophyte ? gametes ? meiosis ? fertilization ? diploid sporophyte D) sporophyte ? spores ? meiosis ? gametophyte ? gametes E) haploid sporophyte ? spores ? fertilization ? diploid gametophyte
Which of the following events do not occur in non-stop mRNA decay?
A. A string of lysine residues are added at the C-terminus of the polypeptide. B. The stalled ribosome recruits Ski7 protein. C. Ski7 protein degrades the defective protein by recognizing the C-terminal poly(Lys) tag. D. An exosome ribonuclease degrades the mRNA.
What technique is used to separate cellular proteins for analysis?
A. Western blots B. Antibody microarrays C. Two-dimensional gel electrophoresis D. Functional protein microarrays
Researchers often want to isolate a certain type of RNA. For some RNA species, this can be accomplished via affinity chromatography, using beads coated with chains of poly-deoxythymidine (poly-dT). The desired RNA will stick to the beads while unwanted RNAs will flow through the column. The retained RNA can then be eluted. What RNA species can be purified using this method?
A. bacterial mRNA B. eukaryotic mRNA C. eukaryotic rRNA D. bacterial rRNA