Which process employs exposing cells cultured in the laboratory to DNA with a gene of interest?
a. transformation
b. transfection
c. DNA fingerprinting
d. polymerase chain reaction
e. gel electrophoresis
A
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Parietal cells secrete pepsinogen. Indicate whether the statement is true or false
This is the most plentiful plasma protein and is the primary molecule involved in maintaining osmotic balance.
A. hemoglobin B. albumin C. carbonic anhydrase D. bilirubin
Phloem functions primarily in
A. transport of water B. growth of the root C. transport of products of photosynthesis D. increasing stem width
Sulfolobus are archaea that are commonly found in geothermal environments, with an optimum growth temperature of about 80°C. What feature allows archaea to thrive at such temperatures?
A. Archaea are highly adaptable to changing environmental temperatures. B. Archaeal membranes contain special lipids. C. Archaea use the heat from their environment to produce ATP. D. Archaea have two cell walls that helps prevent heat absorption.