According to the fluid mosaic model of membrane structure, proteins of the membrane are mostly
a) randomly oriented in the membrane, with no fixed inside-outside polarity.
b) free to depart from the fluid membrane and dissolve in the surrounding solution.
c) embedded in a lipid bilayer.
d) confined to the hydrophobic core of the membrane.
e) spread in a continuous layer over the inner and outer surfaces of the membrane.
Answer: c) embedded in a lipid bilayer.
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Where is gene expression mostly regulated in prokaryotes?
a. At the translational level b. At the epigenetic level c. At the transcriptional level d. At the post-transcriptional level
The symplast connects of the interconnected cell walls
____________________ Indicate whether the statement is true or false.
Molybdenum has an atomic number of 42. Several common isotopes exist, with mass numbers from 92-100. Therefore, which of the following can be true?
A) Molybdenum atoms can have between 50 and 58 neutrons. B) Molybdenum atoms can have between 50 and 58 protons. C) Molybdenum atoms can have between 50 and 58 electrons. D) Isotopes of molybdenum have different numbers of electrons.
The sequence of decreased death rate followed by a decrease in birthrate is called
A. environmental resistance. B. demographic transition. C. doubling time coefficient. D. replacement reproduction. E. a limiting factor.