A cell in G2 before meiosis begins, compared with one of the four cells produced at the end of meiosis II, has
A. twice as much DNA and twice as many chromosomes
B. four times as much DNA and twice as many chromosomes
C. twice as much DNA but the same number of chromosomes
D. four times as much DNA and four times as many chromosomes
E. twice as much DNA and half as many chromosomes
B. four times as much DNA and twice as many chromosomes
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Carbon and hydrogen make up many biologically important molecules. Carbon has an electronegativity of 2.55, whereas hydrogen has an electronegativity of 2.2. Based on the electronegativity difference between the atoms, the carbon and hydrogens shown here have just formed
A. an ionic bond.
B. a hydrogen bond.
C. a polar covalent bond.
D. a nonpolar covalent bond.
E. an element.
Which cell does NOT belong with the others?
a. erythrocytes b. neutrophils c. lymphocytes d. eosinophils e. macrophages
Polar bears are top predators, and tests on their
tissues have shown a surprising a. resistance to warming. b. amount of protein. c. resistance to disease. d. amount of mercury and organic pesticides e. evidence of none of these.
Which of the following occurred in the Precambrian period
What will be an ideal response?