Which of the following about Naegleria fowleri is true?
A) This bacteria typically feeds off of nutrients in the soil.
B) Although debilitating, most patients live long lives.
C) Only the flagellated form of the protozoan is infectious.
D) Infection occurs when contaminated water is ingested.
E) The organism prefers warm stagnant waters.
Answer: E
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When Mendel crossed true-breeding yellow seed plants with true-breeding green seed plants, the offspring were phenotypically:
A. yellow seed. B. green seed. C. a mixture of yellow and green seed. D. made up of a combination of yellow and green alleles.
Imagine that scientists have discovered a new planet apparently devoid of life, but having ice caps located at the poles
These ice caps reveal that the planet's atmospheric O2 levels sharply increased about 1,000,000 years ago, but then quickly dropped 50,000 years ago. What could have accounted for these changes in atmospheric O2 levels? A. Photosynthetic organisms evolved on the planet 100,000 years ago, but went extinct 50,000 years ago. B. Photosynthetic organisms evolved on the planet 50,000 years ago. C. Oxygen-based mammalian life evolved on the planet 100,000 years ago, and photosynthetic organisms evolved 50,000 years ago. D. Oxygen-based mammalian life evolved on the planet 100,000 years ago.
Examine this diagram. Note the structure of branches connecting groups of organisms. Called a phylogenetic tree, the branches propose relationships among organisms to each other, related to common ancestors. Although the proposed relationships can be described in sentences, the diagram summarizes them visually. Which of the following statements is true based on this diagram?
A. All the organisms in this phylogenetic tree are equally related to one another.
B. The organisms in domain Archaea are more closely related to the organisms in domain Eukarya than those in domain Bacteria.
C. The organisms in kingdom Protista are part of domain Bacteria.
D. All of the answer choices are correct.
E. The organisms in domain Bacteria are more closely related to the organisms in domain Eukarya than those in domain Archaea.
Nitric oxide in the exhaust of cars and trucks results in
a. photochemical smog. b. industrial smog. c. a thermal inversion. d. none of these. e. all of these.