For a typical flowering plant, the first cell of the triploid (3n) endosperm is formed from
a. one sperm fused with two antipodal cells.
b. two sperm fused with the egg.
c. one sperm fused with the central cell.
d. one sperm fused with the egg.
e. two sperm fused with a synergid.
C
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Figure 2 depicts the region of cells (shaded gray) in which the even-skipped protein is present in a developing Drosophila embryo. Which of the following statements about the control of the eve gene is likely true based on Figure 2?
A. The Hunchback protein is an eve repressor. B. The bicoid gene is an insulator for eve gene expression. C. The Krüppel protein is an eve repressor. D. The Giant protein is an eve activator.
Which of the following is a characteristic of the taiga biome?
A. long, harsh winters B. nutrient-poor soil C. Conifers are the dominant tree. D. Seed or leaf-eating herbivores are plentiful. E. All of the answer choices are characteristics of the taiga biome.
The most likely result of inhibiting the transport of
potassium into the guard cells is that Chapter 29 Plant Nutrition and Transport 313 a. the stomata will not be able to close. b. water will flow into the cells more freely. c. the stomata will close. d. the rate of photosynthesis will accelerate. e. the production of oxygen will increase.
The number of people in the general population with type AB blood is relatively small. That is fortunate because these people make the least useful donors. Why are these people not as useful as other blood donors?
What will be an ideal response?