Evolution occurs:
A. only through natural selection.
B. only when the environment is changing.
C. only via natural selection, genetic drift, migration, or mutation.
D. almost entirely because of directional selection.
Answer: C. only via natural selection, genetic drift, migration, or mutation.
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A marriage between two related individuals, such as first cousins, is called ____________________.Fill in the blank(s) with the appropriate word(s)
Proteins called ________ surround/associate with DNA to help organize it. These proteins can be modified to alter gene expression
Fill in the blank(s) with correct word
Plasma membranes are best described as a
A) single layer of phospholipids with tails pointed toward the inside of the cell. B) double layer of phospholipids with hydrophilic heads facing away from one another. C) single layer of phospholipids with water molecules attached along one side. D) double layer of phospholipids with hydrophobic tails facing toward one another. E) double layer of phospholipids with hydrophobic tails facing away from each other (toward the cytoplasm of the cell and the extracellular solution).
You would know a dividing cell was a plant cell rather than an animal cell if you saw that ________________.
Fill in the blank(s) with the appropriate word(s).