If a pollen grain lands on the stigma of a plant that is not related to that plant then the following would happen:
A. The pollen grain would be too large or too small to enter the stigma.
B. The pollen would likely not attach to the stigma.
C. The pollen grain would be unable to grow through the stigma.
D. The pollen grain would be unable to form sperm nuclei.
E. The pollen grain would be ejected from the stigma.
C. The pollen grain would be unable to grow through the stigma.
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If the actual results most closely resembled those in part (A) in the figure above, then a further question arising from these data is:
"Do the Dawsonia rhizoids have to be alive to reduce soil nitrogen loss, or do dead rhizoids have the same effect?" Arrange the following steps in the correct sequence to test this hypothesis. 1. Add metabolic poison to the soil of the experimental plot of mosses. 2. Apply water equally to the experimental and control plots. 3. Measure initial soil nitrogen contents of control and experimental plots. 4. Determine nitrogen loss from soil of control and experimental plots. 5. Establish two identical plots of Dawsonia mosses; one as a control, the other as the experimental treatment. A) 5 ? 1 ? 3 ? 2 ? 4 B) 5 ? 2 ? 3 ?? 1 ? 4 C) 5 ? 3 ? 1 ?? 2 ? 4 D) 4 ? 5 ? 1 ? 3 ?? 2 E) 5 ? 3 ? 2 ?? 1 ? 4
Which of the following statements about the cyclic pathway is false? a. In the cyclic pathway, electrons moving through the ETC power the pumping of hydrogen ions into the thylakoid compartment
b. In the cyclic pathway, electrons lost from the photosystem are returned to it. c. The cyclic pathway involves type I photosystems but not type II photosystems. d. The cyclic pathway produces ATP and NADPH.
Genetic divergences may ultimately lead to
a. new variations. b. new species. c. new gene frequencies. d. new competition. e. new alleles
Which of the following produces antibiotics?
a) B-cells b) Orthomxyovirus c) Plasma cells d) Pseudomonas aeruginosa