In deep-sea hydrothermal vents near the Galapagos Islands, bacteria obtain energy by oxidizing hydrogen sulphide released from the vents. Giant tube worms, which lack mouths and digestive systems, harbour the bacteria in their tissues and use them as a source of organic molecules. Clams obtain energy by filtering bacteria directly from the water, and numerous crabs and octopi feed on the clams. In this unique ecosystem, the bactena are playing the role of

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#Question id: 10139

#Unit 6. System Physiology – Plant

There are two distinct forms of rubisco. Form I is found in vascular plants, algae, and cyanobacteria; form II is confined to certain photosynthetic bacteria, Some statements about the Rubisco is given;

a.) A complex form I structure with eight identical large subunits each containing a catalytic site, and eight identical small subunits of uncertain function

b.) The form II rubisco of photosynthetic bacteria is simpler in structure, having two subunits that in many respects resemble the large subunits of the plant enzyme

c.) The plant enzyme has an exceptionally low turnover number; only three molecules of CO2 are fixed per second per molecule of rubisco at 25 o C

d.) Rubisco makes up almost 50% of soluble protein in chloroplasts and is probably one of the most abundant enzymes in the biosphere

Which of the following statements about rubisco will true?

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#Question id: 33278

#Unit 2. Cellular Organization

During chromosome attachment to the mitotic spindle, the tension-sensing mechanism depends on the protein, known as:

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#Question id: 28916

#Unit 4. Cell Communication and Cell Signaling

Which of the following hedgehog (Hh) proteins promotes spermatogenesis?

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#Question id: 5775

#Unit 8. Inheritance Biology

A point mutation that changes a codon specifying an amino acid into a stop codon is called a

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#Question id: 7022

#Unit 5. Developmental Biology

Two teratogens known to cause cyclopia in vertebrates are jervine and cyclopamine. Both targets hedgehog pathway. Both teratogens inhibits: