The phosphate transport system in bacteria imports phosphate into the cell even when the concentration of phosphate outside the cell is much lower than the cytoplasmic phosphate concentration
Phosphate import depends on a pH gradient across the membrane—more acidic outside the cell than inside the cell. Phosphate transport is an example of _____. A) passive diffusion
B) facilitated diffusion
C) active transport
D) cotransport
D
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Morphological characteristics are widely used for taxonomic classifications because
a. they are the most likely indicators of evolutionary relationships. b. they are the most likely to represent reproductive isolation among groups. c. they are easy to assess in living, preserved, or fossilized specimens. d. they are always the exact phenotypic expression of genotypes. e. they indicate genetic relatedness.
Changes in an organism’s genome that have no effect on an individual’s survival or reproduction are called ____
a. amino acid substitutions b. deleterious mutations c. Hox genes d. neutral mutations e. mitochondrial DNA
Which plasma membrane component can be either found on its surface or embedded in the membrane structure?
a) cholesterol b) protein c) carbohydrate d) phospholipid
Why is speciation via changes in ploidy more likely with self-fertilizing plants than with plants that cannot self-fertilize?
What will be an ideal response?