Why is the process of nitrogen fixation by prokaryotes essential?
a. It removes nitrogen from the soil.
b. It converts atmospheric nitrogen to a non-toxic form.
c. It provides nitrogen sources for plants and animals.
d. It provides an energy source for photosynthesis.
e. It allows for the breakdown of complex macromolecules.
C
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Which five chemical elements make up 93-97% of the biomass in plants, animals, fungi, and bacteria?
a. carbon, oxygen, hydrogen, potassium, nitrogen b. carbon, oxygen, hydrogen, sulfur, potassium c. carbon, oxygen, hydrogen, sulfur, nitrogen d. carbon, oxygen, hydrogen, nitrogen, phosphorous e. carbon, oxygen, hydrogen, sulfur, phosphorus
Two species of buttercup are found in a field in North Dakota, and they tend to flower at approximately the same time in early spring
When some ecology students decided to conduct an experiment in community dynamics, they selectively removed one species from the field by hand-picking all emergent plants. The remaining species showed a significant increase in its population size during the next season. This study demonstrated A) niche realignment. B) habitat fragmentation. C) interspecific competition. D) niche fragmentation. E) intraspecific competition.
When a cell uses chemical energy to perform work, it uses the energy released from a(n) ________ reaction to drive a(n) ________ reaction
A) exergonic; endergonic B) endergonic; exergonic C) exergonic; spontaneous D) spontaneous; exergonic
What is not affected by the secretion of oxytocin?
A. Uterine contractions B. Milk-ejection reflex C. Pair bonding D. Milk production