The most plentiful sugar in nature is
a. glucose.
b. fructose.
c. sucrose.
d. lactose.
e. glycogen.
C
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Crenarchaeotes whose optimal growth temperature is over 80 °C are called
A) hyperthermophiles. B) thermophiles. C) extreme halophiles. D) halophiles.
Following a meal glucose must move from the gut lumen where there is a high glucose concentration into the intestinal cell where there is a relatively low level of glucose. This movement is called
A. passive diffusion. B. facilitated diffusion. C. active transport. D. endocytosis. E. exocytosis.
Which of the following organs of the endocrine system secretes cortisol and aldosterone?
a. pituitary gland b. pancreas c. pineal gland d. adrenal glands e. thyroid gland
A gene that contains introns can be made shorter (but remain functional) for genetic engineering purposes by using _____
A) a restriction enzyme (endonuclease) to cut the gene into shorter pieces B) reverse transcriptase to reconstruct the gene from its mRNA C) DNA polymerase to reconstruct the gene from its polypeptide product D) DNA ligase to put together fragments of the DNA that code for a particular polypeptide