What process(es) are required for phospholipids to flip-flop across the lipid bilayer?
A. The process occurs spontaneously and requires the flippase enzyme.
B. The process requires energy and the flippase enzyme.
C. The process requires energy.
D. The process occurs spontaneously, requiring no energy.
E. The process requires an enzyme called flippase.
Answer: B
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In a Punnett square, the letters on top of the square and on the side of the square represent ____
a. offspring genotypes b. zygote genotypes c. parental gametes d. offspring phenotypes e. parental phenotypes
________ reproduction, in contrast, generates genetically unique offspring. To accomplish this, an organism must produce _____, sperm and egg, through the process of _______. The cells produced this way will be _______, meaning that they contain a single set of chromosomes. Such cells are produced only in the ______.
Fill in the blank(s) with the appropriate word(s).
The herbicides (weed killers) 2,4-D and 2,4,5-T are examples of synthetic:a
abscisic acid. b. auxins. c. cytokinins. d. ethylene. e. gibberellins.
The total amount of ATP that a cell gains for each glucose molecule depends on the presence of
A.) water B.) carbon dioxide C.) oxygen D.) glucose