?A Barr body is a(n) ____.
a. activated X chromosome
b. inactivated X chromosome
c. immature trophoblast
d. immature blastocyst
e. mature blastocyst
Answer: b. inactivated X chromosome
You might also like to view...
Which of the following statements is true regarding T cell receptors? Select all correct
A. They recognize antigen-MHC complexes. B. They contain variable and constant regions. C. They are composed of two heavy (H) chains and two light (L) chains. D. They are formed by the rearrangement of V, J, C, and D gene segments. E. They can be found in the bloodstream independent of T cells.
A 6.85 kb EcoRI fragment of DNA is shown below. The location of several restriction sites is indicated. Scale is approximate.
©McGraw-Hill EducationIf you were to completely digest this fragment of DNA with PstI, how many pieces of DNA would you obtain?
A. 1 B. 2 C. 3 D. 4
The process known as ________ is a mechanism of release for enveloped viruses
A) lytic replication B) persistent infection C) metastasis D) latency E) budding
Which of the following is important for the attachment stage of the HIV life cycle?
A. cleavage of the proteins by protease B. gp120 spike proteins C. acquisition of an envelope from the host D. uncoating E. integration of the viral DNA into the host genome