Which of the following are not sub-compartments of the nucleus?
a. Clustered DNA replication sites
b. Lipid droplets
c. PML bodies
d. Speckles enriched in RNA splicing components
Ans: b. Lipid droplets
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Which classification represents all of the species that are similar to one another and distinct from others with respect to
certain traits? a. class b. order c. family d. genus e. species
The only protozoan that causes an STI that affects mostly women is
a) Trichomonas vaginalis. b) Gardnerella vaginalis. c) Mycoplasma hominis. d) Haemophilus ducreyi.
Which of the following statements concerning B cell receptors (BCRs) is FALSE?
A) They are formed in response to an encounter with an antigen. B) They are complementary in shape to a specific antigenic determinant that they may or may not encounter. C) They are bound to the surface of B lymphocytes and have two antigen-binding sites. D) Each B lymphocyte is randomly generated with antibody variable regions that determine its BCR. E) Scientists estimate that each person forms at least 1011 different types of B lymphocytes with distinct BCRs.
What is the name of the enzyme that fits new complementary DNA nucleotides into the new strand?
A. DNA telomerase B. DNA replicase C. DNA polymerase D. DNA ligase E. DNA helicase