Millions of years ago, the activity of which cellular organelle would have been dependent upon the presence of
cyanobacteria?
a. Golgi
b. nucleus
c. ribosome
d. mitochondrion
e. endoplasmic reticulum
d
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The first part of the renal tubule is called the _____ and is specialized for _____
A. proximal convoluted tubule; reabsorption of electrolytes and other nutrients. B. loop of Henle; creation of a concentration gradient in the interstitial fluid C. distal convoluted tubule; secretion of additional wastes into the urine D. distal convoluted tubule; reabsorption of water E. collecting duct; reabsorption of water
A new DNA strand elongates only in the 5' to 3' direction because
A) DNA polymerase begins adding nucleotides at the 5' end of the template. B) Okazaki fragments prevent elongation in the 3' to 5' direction. C) the polarity of the DNA molecule prevents addition of nucleotides at the 3' end. D) replication must progress toward the replication fork. E) DNA polymerase can only add nucleotides to the free 3' end.
What does "You are what you eat" really mean?
What will be an ideal response?
Treatment of gas gangrene may involve ________.
A. antitoxins B. wound debridement C. hyperbaric chambers D. All of the choices are correct.