What is the difference between cross- and self-fertilization?
A) In cross-fertilization the pollen from one plant is used to fertilize the egg of another plant.
B) In cross-fertilization the pollen from one plant is used to fertilize the egg from the same plant.
C) In self-fertilization the pollen from one plant is used to fertilize the egg from another plant.
D) In cross-fertilization insects are used to pollinate the plants, whereas in self-fertilization the investigator pollinates the plants.
A) In cross-fertilization the pollen from one plant is used to fertilize the egg of another plant.
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Answer the following statements true (T) or false (F)
1. Myosin is a motor protein that walks along intermediate filaments. 2. The flagellum is composed of a 9 + 2 arrangement of microtubules called the axoneme. 3. The Golgi apparatus is much like a warehouse; it processes proteins and sorts them for delivery to certain parts of the cell. 4. Materials move in and out of the nucleus via endocytosis and exocytosis. 5. Both lysosomes and peroxisomes are important for detoxifying substances in the cell.
Why did the dinosaurs become extinct?
A. A meteorite or comet crashed into the Earth, causing smoke and ash that blocked the sun and caused death of the plants that were food for dinosaurs. B. The cycads upon which dinosaurs fed were purgatives and when they declined the dinosaurs, unable to digest flowering plants, died of constipation. C. Increasing carbon dioxide levels produced climates too hot for the incubation of their eggs. D. Increase in the number of ferns produced so many spores in the atmosphere that dinosaurs suffered from lung irritation. E. The pollen produced by the rise in flowering plants produced allergenic responses in dinosaurs.
A(n) ________ is one that is present in the common ancestor and all members of a group.
A. cladistic characteristic B. shared derived character C. shared ancestral character D. analogous structure E. divergent characteristic
Beadle and Tatum discovered that each mutant mold they observed lacked a specific enzyme. As a result, they concluded that _________.
A. genes are made of DNA B. genes carry information for making proteins C. mutations are changes in genetic information D. cells need specific enzymes to function