What are the three main components of a DNA nucleotide?
What will be an ideal response?
A DNA nucleotide contains a sugar (deoxyribose), a phosphate group, and a nitrogen-containing base.
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Bioluminescence is:
A. the production and emission of light by organisms B. the capture of moonlight for nocturnal photosynthesis C. the absorption of light by pigments for transfer to chlorophyll a D. the ability to detect and move away from sources of light E. the ability to detect and move toward sources of light
Imagine that you are a farmer who chose not to rotate your crops with soybeans even though the local extension agent recommended that you do so. Which deficiency symptom in your crops should indicate to you that the extension agent's advice was correct?
a. chlorosis and mottled or bronzed leaves b. burned leaf edges and curled, mottled, or spotted older leaves c. purplish veins d. pale green, rolled, or cupped leaves e. chlorosis in older leaves and stunted growth
When is a cell in metaphase?
a. The chromosomes are visible as threadlike structures. b. The nuclear envelope is clearly visible. c. The chromosomes are aligned at the midplane of the cell. d. The chromosome are separated into distinct groups at opposite poles of the cell. e. Cytokinesis is occurring
The following characteristics all helped seedless plants become better adapted to land except
A) a dominant gametophyte. B) vascular tissue. C) a waxy cuticle. D) stomata on leaves. E) a branched sporophyte.