The substances that donate electrons to the electron transport chains of chemolithotrophs are ________.
A. lipids
B. methane gas and alcohols
C. carbohydrates
D. inorganic compounds
Answer: D
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A newly described fungal species has been isolated from the rumen of sheep. It is microscopic, unicellular, and produces spores that have a flagellum. This species will most likely be classified as a(n) ________.
A. Chytridomycete B. Ascomycete C. Microsporidia D. Basidiomycete E. Glomerulomycete
Primary immunodeficiency diseases
A) develop later in life. B) are detectable close to birth. C) may be caused by malnutrition. D) are never associated with genetic defects. E) are sometimes caused by severe stress.
All of the following influenced Darwin as he synthesized the theory of evolution by natural selection except _________.
A. the biogeographic distribution of species such as the mockingbirds on the Galapagos Islands B. Lyell's book Principles of Geology on the gradualness of geologic changes C. examples of artificial selection that produce rapid changes in domesticated species D. Linnaeus's hierarchical classification of species which could be interpreted as evidence of evolutionary relationships E. Mendel's paper in which he described his "laws of inheritance"
A species colonizes an island, goes through a phase of exponential growth, and reaches the carrying capacity of the island. At what stage is the growth rate slowest?
A. After reaching K B. Exponential phase C. Initial colonization D. Approaching K