The scientist(s) who developed the "sandwich" model of the cell membrane is (are)
A) Overton.
B) Langmuir.
C) Gorter and Grendel.
D) Davson and Danielli.
E) Robertson.
E) Robertson.
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________ produce 40 to 50 percent of the organic carbon in the ocean.
Fill in the blank(s) with the appropriate word(s).
Which is an example of a quantitative trait?
A. People who are homozygous for the group of genes associated with skin pigment have either lighter or darker skin than those who are heterozygous for those genes. B. The alleles of the gene for red hair color is masked by the gene for brown hair color. C. A person heterozygous for dwarfism will always have the dwarf phenotype. D. A woman who has one allele for color blindness will not be color blind, but a man who has one allele for color blindness will be color blind. E. 25% of the offspring from a cross of two fruit flies that are heterozygous for curly wings will have curly wings.
The density of cold water at great depths is
a. lower than surface waters. b. similar to the surface waters. c. higher than the surface waters. d. always the same throughout the water column. e. variable, depending on latitude.
A coelom is found in ____
a. flatworms b. earthworms c. humans d. earthworms and flatworms e. humans and earthworms