Which part of a bird's digestive system contains sand and rocks to aid in mechanical digestion?
a. crop
b. esophagus
c. gizzard
d. pharynx
e. proventriculus
C
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Bacteria that resist killing by complement proteins are termed
A. carriers. B. serum resistant. C. balanced pathogens. D. mutualistic. E. carriers AND serum resistant.
Why is the poly-A tail added to mRNA before it leaves the nucleus?
a. It provides a destination for movement in the cell. b. It protects against exonuclease activity. c. It notifies the cell that this molecule is “self.” d. It provides the final instructions for protein synthesis.
Which of these are symbioses?
What will be an ideal response?
Why is the polymerase chain reaction (PCR) so useful for DNA fingerprinting?
A) It can produce millions of copies from tiny amounts of DNA. B) It can be used to compare DNA from different individuals. C) It can identify the complete sequence of a gene. D) It can allow scientists to visualize the DNA of specific individuals.