Which of the following is an example of natural selection?

A) depending on the food a turtle eats, it shell may grow faster or slower
B) a bird's beak is able to effectively crack the seeds it encounters
C) bacteria can be effectively killed by treatment with bleach
D) sometime during human's life they break a bone and it heals
E) human beings develop freckles from being out in the sun


Answer: B

Biology & Microbiology

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1. Allantois 2. Yolk sac 3. Chorion 4. Amnion a. Protection of the embryo b. Gas exchange c. Compartmentalizes wastes d. Contains nutrients

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Gene transcription is induced by

a. A. b. B. c. C. d. D. e. none of these

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Correns found that the inheritance of variegated color on the leaves of certain plants was determined only by the maternal parent. What phenomenon explains this pattern?

A) ribosome structure B) chloroplast inheritance C) genomic imprinting D) sex-linkage

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Woody plants have which two compounds in their cell walls?

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