The activity of the ribosome in translation is
like a(n)
a. assembly line.
b. dance.
c. planet racing around the sun.
d. foot race.
e. chess game
A
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Use the following information to answer the question(s) below
Due to its system of air sacs connected to the lungs, the respiratory system of birds is arguably the most effective respiratory system of all air-breathers. Upon inhalation, air first flows into posterior air sacs, then into the lungs, and then into anterior air sacs on the way to being exhaled. Thus, there is one-way flow of air through the lungs, along thousands of tubules called parabronchi. If the inner lining of the air sacs is neither thin nor highly vascularized, then what can be inferred about the air sacs? A) They must not belong to the respiratory system. B) They cannot be derived from endoderm. C) They are not efficient sites of gas exchange between air and blood. D) They must obtain nutrition from some source other than the bloodstream. E) They cannot effectively moisturize the air before it reaches the lungs.
All of the orbitals shown in the neon atom in the figure are completely filled with electrons. How
many electrons does this neon atom have?
a. 5 b. 6 c. 8 d. 10 e. 16
A layer of endodermal cells around the cylinder
deposit a waterproof band called a __________ in their abutting walls. Fill in the blank(s) with the appropriate word(s).
Throughout the 1920s, Otto Meyerhof, A. V. Hill, and colleagues investigated how cells use energy to power muscle contraction. They determined that during muscle contraction, glycogen is broken down into lactic acid, a product of fermentation. Originally Meyerhof thought that the conversion of glycogen into lactic acid directly powered muscle contraction. This idea was overturned by experiments performed by Einar Lundsgaard. What evidence did Lundsgaard provide to suggest that glycogen breakdown and lactic acid production did not directly power muscle contraction?
A.) inhibition of fermentation of immediately halted muscle contraction B.) creatine phosphate infusions into muscle cells inhibited muscle cell contraction C.) muscle contraction could continue for some time after inhibition of fermentation D.) a pulse of electricity caused muscle contraction in isolated frog muscle tissue