A bacterium is found that can photosynthesize in the presence of light but uses hydrogen sulfide and releases elemental sulfur as a bi-product. This organism can best be classified as a
A. chemolithoautotroph.
B. chemoheterotroph.
C. photoautotroph.
D. photoheterotroph.
E. pathogen.
D. photoheterotroph.
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Imagine that horn color in Hodags (folkloric creatures of Wisconsin) is controlled by a single gene so that when you mate a Hodag homozygous for bright orange horns (COCO) with a Hodag homozygous for ivory horns (CICI), numerous offspring are produced, all with pale orange horns. Now consider that you cross an orange-horned Hodag with an ivory-horned Hodag and get an F1.
A. 9 bright orange: 6 pale orange: 1 ivory B. 1 bright orange: 2 pale orange: 1 ivory C. 3 bright orange: 1 ivory D. 1COCO: 2COCI: 1CICI E. 3COCO: 1CICI Clarify Question
How do plants form primary cell walls?
What will be an ideal response?
Organisms called parasites are ________.
A. always harmful to their host B. always viruses C. free-living D. the decomposers in ecosystems
Why are conifers and cycads considered gymnosperms?
A. The pollen is wind-dispersed. B. The fruit is not fleshy. C. Pollination and fertilization occur at different times. D. The female gametophyte is not completely enclosed in sporophyte tissue at the time of pollination. E. They have true vascular tissue but do not form seeds.