Biology, 12.02.2021 20:20 gracedaniels68
1. Moves molecules from high to low concentration
II. Moves molecules with the concentration gradient
10. Does not require energy
IV. Requires the use of a membrane protein
V. Used to move small and/or nonpolar molecules
VI. Used to move large and/or polar molecules
Cell membranes are selectively permeable, regulating which substances can pass through, as well as how much of each substance
can enter or exit at a given time. In cells, some molecules can move down their concentration gradients by crossing the
phospholipid portion of the membrane directly, while others must pass through membrane proteins. Which of these statements
applies ONLY to facilitated diffusion and NOT diffusion?
A)V and VI
B)IV and Vl
C)II and IV
D)III and IV
Answers: 3
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What best explains whether bromine (br) or neon (ne) is more likely to form a covalent bond? bromine forms covalent bonds because it has seven valence electrons, but neon has eight valence electrons and already fulfills the octet rule. bromine forms covalent bonds because it has many electron shells, but neon has only two electron shells and is tightly bound to its electrons. neon forms covalent bonds because it can share its valence electrons, but bromine has seven valence electrons and can gain only one more electron. neon forms covalent bonds because it has only two electron shells, but bromine has many electron shells and will lose electrons in order to fulfill the octet rule.
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The primary organisms involved in the process bacteria and fungi.
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1. Moves molecules from high to low concentration
II. Moves molecules with the concentration gradie...
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