Which of the following proteins are part of the first line of defense against microbial invasion?
A) dermacidins
B) TLRs
C) NOD proteins
D) C3 and C5
E) interferons
A
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Prions are
A. strands of nucleic acids encased in a protein coat. B. viral nucleic acids integrated into the host chromosomes. C. viral-infected cells. D. infectious proteins with no associated nucleic acid. E. proteins coded by genes.
A mutation in the gene encoding the enzyme that cuts F factor DNA during conjugation would result in
A. an inability to separate the recipient DNA from the donor DNA. B. an inability to draw the conjugated cells close enough to allow DNA transfer. C. the transfer of single-stranded DNA instead of double-stranded DNA. D. the inability of the donor DNA to move through the pilus. E. the inability of the recipient cell to replicate the F factor after transfer.
State at least two factors which contributed to increased exploration of the oceans in the 18th and 19th centuries?
What will be an ideal response?
The vascular tissue that conducts water and mineral ions is called ____
a. sieve elements b. companion cells c. sclerenchyma d. xylem e. phloem