A trip to space finds a planet rich with green light. Scientists hope to introduce a photosynthetic organism to this planet. What sort of organism should they choose?
What will be an ideal response?
This would be difficult, but a plant rich in phycoerythrobilin might work as that pigment is able to absorb green light.
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Which statement factors into artificial but not natural selection?
A. Most organisms are capable of producing more offspring than typically survive. B. Phenotypic variation of a species has variable appeal to humans interested in that species. C. Phenotypic variation exists within populations. D. Phenotypic variation can influence reproductive success. E. Phenotypic variation within a species is due in part to inherited characteristics.
Which of the following is true of purines?
A) Cytosine is a purine. B) Adenine's bonding to thymine is stronger than is guanine's to cytosine. C) Purines have a double-ringed structure. D) Both adenine and thymine are purines. E) Purines bind readily to deoxyribose but not to ribose.
The natural habitat of Ochrobactrum spp. can best be described as the:
a. mucous membranes of animals. b. gastrointestinal tract of humans and other animals. c. natural environment. d. genitourinary tract of animals.
Which of the following is NOT a function of the spinal cord?
a. It interprets the sensory nerve action potentials as sensations. b. It carries motor nerve action potentials from the brain to the effectors. c. It carries sensory nerve action potentials from the sensory receptors to the brain. d. It serves as a reflex center.