Which of the following statements about abscisic acid are true? Check all that apply.  

_____  It is produced chiefly in mature green leaves and in fruits.
_____  It stimulates the growth of dormant buds.
_____  It promotes leaf senescence.
_____  It plays an important role in controlling the opening and closing of stomata.
_____  It plays a role in seed dormancy.


__X__  It is produced chiefly in mature green leaves and in fruits.
_____  It stimulates the growth of dormant buds.
__X__  It promotes leaf senescence.
__X__  It plays an important role in controlling the opening and closing of stomata.
__X__  It plays a role in seed dormancy.

Biology & Microbiology

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Why do phospholipids form sheet-like cellular membranes, despite being partly hydrophilic?

a. The modified phosphate group forms covalent bonds with adjacent phospholipids in a sheet-like configuration. b. Cellular membranes form at the water’s surface, with hydrophobic fatty acids extended into the air above. c. The long fatty acid chains weave together like a tapestry, pulling the phosphate groups together in sheets. d. Only the phosphate group can interact with water; fatty acids are forced together in the middle of double sheets.

Biology & Microbiology

Tall corn plants (T) are dominant to dwarf plants (tt). Solid green leaves (G) are dominant to leaves with a white tip (gg). A cross between two corn plants yielded the following phenotypes: 51 tall plants with a white tip on their leaves; 43 dwarf plants with solid leaves; 48 dwarf plants with white tips on their leaves; 45 tall plants with solid leaves. What are the genotypes of the parents

that produced these plants? a. TtGg x TtGg b. TtGg x Ttgg c. ttGG x TTgg d. TtGg x ttgg e. None of the above

Biology & Microbiology

You have some old plastic Petri dishes that you would like to use for pouring bacteriological agar plates. The only method of physical sterilization is ultraviolet radiation sterilization with your UV light (you cannot use the autoclave because it will disfigure and melt the plastic). After sterilizing the plates, pouring the sterilized agar medium, and then leaving the plates out at room temperature for a day or two to let them solidify and dry, you find contaminating bacterial colonies growing on the agar. Predict what has happened in this situation.

A. The room temperature enhanced the growth of normal biota of the agar. B. The agar had bacteria in it, even after sterilization in the autoclave. C. Air got into the poured agar plates, contaminating them. D. The lids of the Petri dishes were inadvertently left on while being sterilized.

Biology & Microbiology

Estrogen has a direct effect on the

A. formation of a zygote B. changes within the uterus C. movement of an egg toward the sperm D. development of a placenta within the ovary

Biology & Microbiology