Of all the possible amino acids, all living organisms make use of only the same 20 amino acids. This supports the idea that
A) only a limited number of DNA mutations are possible.
B) bacteria, animals, and plants developed independently.
C) natural selection drives evolution.
D) only 20 amino acids exist on Earth.
E) all living things are derived from a single common ancestor.
E
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Which molecule dissolves in water vapor and falls as acid precipitation?
a. sulfuric acid b. ozone c. mercury d. sulfur dioxide e. carbonic acid
Chromosome pair number 23 is classified as
a. centrosomes. b. somatosomes. c. sex chromosomes. d. autosomes. e. corposomes.
In animals, what is the difference between reproductive cloning and therapeutic cloning?
A) Reproductive cloning uses totipotent cells, whereas therapeutic cloning does not. B) Reproductive cloning uses embryonic stem cells, whereas therapeutic cloning does not. C) Therapeutic cloning uses nuclei of adult cells transplanted into enucleated nonfertilized eggs. D) Therapeutic cloning supplies cells for repair of diseased or injured organs.
The glycocalyx is:
A. combination of proteins and lipids that protrude from the external surface of the plasma membrane B. combination of glycoproteins and glycolipids that protrude from the external surface of the plasma membrane C. combination of glycoproteins and carbohydrates that protrude from the external surface of the plasma membrane D. combination of lipoproteins an carbohydrates that protrude from the external surface of the plasma membrane E. combination of glycoproteins and cholesterol that protrude from the external surface of the plasma membrane