Molecular data suggests that land plants evolved from
A. rhodophyta.
B. charophytes.
C. dinoflagellates.
D. the water molds.
E. ciliates.
Answer: B
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An effective means used early in the 19th century to clear water of the majority of bacteria was the use of
A. chlorine. B. iodine. C. alcohol. D. sand filters
Through studies using the animal cap assay this morphogen was shown to be important for the determination of the different types of mesoderm tissue in the developing embryo.
A. activin B. noggin C. Spemann's organizer D. Hox gene E. cadherins
All of the following can contribute to
desertification EXCEPT a. drought. b. overplowing. c. overgrazing. d. natural fertilizer. e. All of these can contribute to desertification
Which of the following is not a feature of a seed?
A. Environmental signals such as light or temperature can trigger germination. B. It contains a protective coat formed from the outer layers of ovule cells. C. It is a complex structure that allows the embryo to be dispersed to distant sites. D. The embryo is surrounded by nutritive tissue or has cotyledons that contain nutritive tissue. E. It contains a large percentage of water to support the embryo.