The principal force driving movement in diffusion is _______.
a) membrane surface area
b) concentration gradient
c) temperature
d) particle size
Ans: b) concentration gradient
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During aerobic respiration in eukaryotic cells, glycolysis occurs in the ______ and the Krebs cycle occurs in the _____
1.cytoplasm, chloroplast 2.mitochondrion, chloroplast 3.cytoplasm, mitochondrion 4.mitochondrion, ribosome
All amino acids are characterized by
A. an amino group and a peptide bond. B. a carboxyl group and a peptide bond. C. the presence of two R groups. D. an amino group and a carboxyl group. E. none of these.
The part of the brain that controls the basic responses necessary to maintain life (such as breathing and heartbeat) is the ____.
A. medulla oblongata B. corpus callosum C. pineal gland D. cerebellum E. cerebral cortex
According to the _________________ theory, early undifferentiated lymphocytes in the embryo and fetus undergo a continuous series of divisions and genetic changes that generate hundreds of millions of different cell types, each carrying a particular receptor.
A) Genetic recombination B) Clonal deletion C) Molecular mimicry D) Clonal selection