Which of the following statements about plant embryo development is correct?
A. The plant hormone abscisic acid is important in the development of the shoot-root axis.
B. The development of the shoot and root apical meristems is controlled independently.
C. The protoderm establishes the procambium tissue in the young plant embryo.
D. The suspensor forms from the shoot apical meristem before development of the root apical meristem.
Answer: B
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In the late nineteenth century, immigration from Ireland to the United States occurred in high numbers due to an infection of potatoes by
A. bacteria. B. viruses. C. fungi. D. amoeboid protozoa. E. water molds.
Answer the following statements true (T) or false (F)
1. Streptomyces are aerobic soil bacteria that produce over two-thirds of our antibiotics of natural origin. These antibiotics should also be effective in killing Streptomyces. 2. Streptomyces are obligate aerobic soil bacteria that infect many plant roots, causing scabs on their leaves. You would expect to find more Streptomyces near the surface of the soil. 3. Antibiotics usually are not dangerous to use in treating bacterial infections because most antibiotics exploit structures and functions in bacteria that are not present in host cells. 4. Pili are bacterial structures used primarily for motility. 5. Autotrophs must acquire carbon from organic molecules produced from other organisms.
Ribose has five carbon atoms, of which three are asymmetric. What is the maximum number of stereoisomers that may exist for ribose?
A) 2 B) 4 C) 6 D) 8 E) 10
Gene targeting has been used in mice to produce strains that were either homozygous or heterozygous for ____
a. PKU b. cystic fibrosis c. Huntington's disease d. sickle cell anemia e. Tays Sachs Disease