In a healthy cell, the rate of DNA repair is equal to the rate of DNA mutation. When the rate of repair lags behind the rate of mutation, what is a possible fate of the cell?
A) The cell can be transformed to a cancerous cell.
B) RNA may be used instead of DNA as inheritance material.
C) The cell will become embryonic.
D) DNA synthesis will continue by a new mechanism.
A
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In radishes, long or round are homozygous forms of an incompletely dominant gene, and oval is the phenotype of the heterozygote. If a long radish is crossed with a round radish, which of the following phenotypic ratios of the F2 generation is correct?
A. all round B. all oval C. 1/2 long, 1/2 oval D. 1 long, 2 oval, 1 round E. 1/2 oval, 1/2 round
Which of the following statements about diffusion is false?
A. It transports materials actively along a concentration gradient. B. It is effective only over small distances. C. It limits the size of prokaryotic cells. D. It limits the shape of prokaryotic cells. E. It supplies key molecules for metabolism.
Hydrogen bonds in water collectively exert a continuous pull on its individual molecules. Therefore, water molecules resist separating from each other. This property is called:
a. ionic bonding b. solvency c. polarity d. hydrophilic tension e. cohesion
The fastest lions are able to catch prey, such as zebras; similarly, the fastest zebras are able to escape predatory lions
Over time, the lion and zebra populations become composed of faster and faster individuals. This is an example of ____.
a. mutualism b. competition c. coevolution d. disruptive selection e. sexual selection