Cell membranes consist mainly of a _____
a. carbohydrate bilayer and proteins c. lipid bilayer and proteins
b. protein bilayer and phospholipids
C
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The science of ____ explains the origin of life, the persistence of life, and studies the changes in living
things.
a. nanotechnology b. mathematics c. biology d. chemistry e. pharmacology
_________ occur where winter drought reduces photosynthesis and most trees drop their leaves
a. Tropical montane forests b. Tropical deciduous forests c. Boreal forests d. Dry savannas e. Temperate forests
A set of symptoms that usually occur together and characterize a disorder is called
a. an abnormality. b. a deviation. c. a syndrome. d. a carrier. e. a pedigree.
Calico cats are never male because:a
recessive genes are not usually expressed on their X chromosome. b. male hormones prevent expression of the calico phenotype. c. two different X chromosomes are needed for the expression of the calico phenotype. d. two different Y chromosomes are needed for the expression of the calico phenotype. e. one X chromosome and one Y chromosome are needed for the expression of the calico phenotype.