After infecting the cell, HBV's gapped DNA is released into the nucleus where host ________ enzymes fill the gap and seal the nick, yielding a covalently closed, circular DNA.
Fill in the blank(s) with the appropriate word(s).
repair, Repair
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Which of the following serves as a protective layer around mammalian eggs?
a. zona pellucida b. lysosome c. seminiferous tubule d. endoderm
During DNA replication, the primary role of DNA polymerase I is to?
a. synthesize DNA in the 5' to 3' direction only on the leading strand b. unwind DNA at the replication fork c. prevent single stranded DNA in the replication bubble from forming secondary structures d. remove RNA primers from newly synthesized strands of DNA
The human immunodeficiency virus (HIV) is so named because it cripples the immune system by attacking and destroying helper T cells (TH cells). What cell surface protein does the HIV virus most likely use to bind to and infect the TH cells?
A. CD8 B. Defensin C. CD4 D. MHC class I proteins E. Membrane-attack complex F. Mannose-binding lectin protein G. Toll-like receptor
The lymphatic system has the following functions except:
a. Transport b. Regulates the plasma in the body c. Defense d. Absorption of fat