Question

You are asked to determine whether an unknown tissue specimen comes from a plant or an 3. animal. Closer inspection with an electron microscope reveals that the cells are connected by small openings lined by extensions of the cell membrane and containing tubules connecting the endomembrane your observations? systems of adjacent cells. Which of the following conclusions can you draw from a. The openings are plasmodesmata, so the tissue must come from a plant. b. The openings are plasmodesmata, so the tissue must come from an animal. c. The openings are gap junctions, so the tissue must come from a plant. d. The openings are gap junctions, so the tissue must come from an animal. e. The openings could be either gap junctions or plasmodesmata, so it cannot be determined whether the tissue came from a plant or an animal. Answer 4. In many plants, it is possible to peel off the lower epidermis of a leaf without disturbing the photosynthetic mesophyll cells, thereby exposing the mesophyll directly to the air. What would you expect the immediate (seconds to minutes) response of photosynthesis to be? What would you expect the longer-term (minutes to hours) response of photosynthesis to be? a. immediate increase, long-term decrease b. immediate decrease, long-term increase c. no change immediately, long-term decrease d. no change immediately, long-term increase Answer 5. How would subjecting a CAM plant at night to normal daytime temperatures affecet its water use efficiency (CO; captured /H:0 lost)? a. CO2 capture would increase, due to a temperature-induced increase in PEP carboxylase activity, which is enough to increase water use efficiency b. CO2 capture would decrease due to temperature inhibition of rubisco, which would decrease water use efficiency c. Water use efficiency would decrease due to an increasing concentration gradient for diffusion of water out of the leaf at night. d. Water use efficiency would increase due to more rapid diffusion of CO2 during the day Answer 6. Water transport in xylem depends on: a. hydrogen bonding between H20 molecules. b. turgor pressure accumulating in the roots. c. osmosis across the vessel plasma membranes. d. light-activated proton pumps in leaves. Answer_

Answer 1

are asked to determine whether an unknown tissue specimen comes from a plant or an 3. You animal. Closer inspection with an electron microscope reveals that the cells are connected by small openings lined by extensions of the cell membrane and containing tubules connecting the endomembrane vour observations? systems of adjacent cells. Which of the following conclusions can you draw from The openings are plasmodesmata, so the tissue must come from a plant. he openings are plasmodesmata, so the tissue must come from an animal. c. The openings are gap junctions, so the tissue must come from a plant. d. The ope e. The openings could be either gap junctions or plasmodesmata, so it cannot be determined nings are gap junctions, so the tissue must come from an animal. whether the tissue came from a plant or an animal. Answer A Plants have plasmodesmata instead of gap junctions that provide cell-to-cell communication. Plasmodesmata and gap junctions are communicating channels between adjacent cells, they are several in numbers per cell, and their size is within nano meters (nm)