An important mineral ion found in the cytochrome pigments of cellular respiration is ________.
A. potassium
B. calcium
C. magnesium
D. iron
E. zinc
Answer: D
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In Engelmann's classic experiment, why were the oxygen-requiring bacteria clustered around the regions of Spirogyra algae that were bathed in red, blue, and violet light?
a. Chlorophyll is green and thus reflects green light. b. The bacteria were immobile and that is where Engelmann happened to place them. c. Photosynthesis is most active in those wavelengths of light and thus more oxygen is consumed by the algae in those regions. d. Photosynthesis is most active in those wavelengths of light and thus more oxygen is produced by the algae in those regions. e. The most energy-rich wavelengths of light are found at the edges of visible and nonvisible light (ultra violet and infrared).
“Tardigrada” means
a. tough exoskeleton. b. many proglottids. c. slow walker. d. short digestive system. e. coelom.
Fossils found in the lowest geological strata are generally the most
a. advanced. b. complex. c. primitive. d. widespread. e. specialized.
IA and IB alleles exhibit ________ (complete or incomplete) dominance over the i allele
Fill in the blank(s) with correct word