What are the possible solutions to the problem of replicating the ends of linear prokaryotic DNA molecules?
What will be an ideal response?
Ans: There are several possible solutions to this problem. First, the single molecule may be circularized or polymerized so that free ends no longer exist. Second, a secondary structure, such as a hairpin, may form at the ends so that no free end exists. Third, the end of the molecule may be kept variable by adding additional copies of a repeating unit so that replication doesn't have to occur to the very end. Fourth, a protein may bind to the free ends to allow initiation of replication.
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How do scientists most often access genome sequences determined by research projects?
a. They must request the sequence from the group that performed the research. b. They must request the sequence from the governmental or private group that funded the research. c. They must request the sequence from the company that performed the sequencing. d. They can retrieve the sequence from an online public database, such as GenBank. e. They must sequence the organism themselves to obtain the sequence.
If your grandparents were in the F1 generation, what generation are you in?
A) F3 B) H3 C) P D) P3
Which one of the following does not match a component of the amniotic egg with its primary function?
A. Shell-porous, protective covering B. Yolk sac-provides food for the embryo C. Allantois-segregates nitrogenous wastes from embryo D. Chorion-exchange of respiratory gases; retention of water E. Amnion-encloses embryo within an oxygen-filled cavity
In the formation of ectomycorrhizae, a single tree can form associations with
a. a single fungal species in the soil. b. a single bacterial species in the soiI. c. multiple bacterial species in the soil. d. multiple fungal species in the soil.