A particular flower can be purple, blue, red, or white. Two different pure-breeding white plants are crossed and the F1 are then crossed to produce an F2 generation. What might a 9:7 phenotypic ratio in the F2 indicate?
A) reciprocal recessive epistasis
B) codominance
C) dominant epistasis
D) recessive lethality
E) additivity
A) reciprocal recessive epistasis
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What are isomers?
A. Two elements that can bond with each other B. Two molecules that have the same arrangement of atoms C. Two atoms that have the same ionic properties D. Two molecules that have the same atoms arranged differently
Which of the following is the advantage that plants in arid habitats experience when they keep their stoma closed during hot daytime hours?
A. It prevents loss of CO2. B. It helps to conserve water. C. It brings minerals up the plant. D. It prevents sugar transport to the guard cells. E. It gives plants a needed rest.
The bulk of a plant is made from ________
A) minerals from the soil obtained by the roots of a plant B) sugars from the soil obtained by the roots of a plant C) the sugars made in photosynthesis, which were made from carbon dioxide D) oxygen absorbed by the pores in leaves
Which piece of evidence best supports the endosymbiotic theory of organelle evolution?
A. Mitochondria and chloroplasts both contain DNA and some can make their own proteins. B. Mitochondria and chloroplasts divide by binary fission. C. The outer membrane of chloroplasts and mitochondria resembles that of a eukaryotic cell while the inner membrane resembles that of a bacterial cell. D. Mitochondria and chloroplasts are the same size as bacteria. E. All of these are correct.