DNA analysis of mitochondrial and nuclear DNA from the Y chromosome supports the ____ hypothesis of the origin
of the species Homo sapiens.
a. out of Africa
b. Homo genus
c. multiregional
d. multinational
e. Asian focus
a
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Which two observations led Darwin to conclude that there is competition for survival?
A. Fossils and mutations B. Overproduction of organisms and limited food resources C. Gene and allele differences in organisms D. Natural selection and descent with modification
Hydrogen bonding is strongest between ____
a. adenine and guanine b. uracil and thymine c. guanine and uracil d. adenine and thymine e. cytosine and guanine
Scientists sometimes use gene sequencing to establish a family tree. A family tree shows the evolutionary relationship between various species. The fewer the differences that are present in the genetic makeup between two species, the closer their evolutionary relationship. What type of evidence does gene sequencing represent?
A) comparative embryology B) identification of a common ancestor C) molecular biology D) comparative anatomy
A cell containing 98% water in its cytoplasm is placed in a 2% salt solution. It should
a. lose water b. gain water c. neither lose nor gain water d. gain salt because of the high rate of diffusion