#Question id: 12777
#Unit 10. Ecological Principles
#Question id: 26496
#Unit 3. Fundamental Processes
#Question id: 1301
#Unit 4. Cell Communication and Cell Signaling
The cell walls of bacteria, fungi, and plant cells, and the extracellular matrix of animal cells are all external to the plasma membrane. Which of the following characteristics are common to all of these extracellular structures?
#Question id: 28645
#Unit 2. Cellular Organization
Which of the activity ensuring that replication from each origin occurs only once during each cell cycle?
#Question id: 9592
#Unit 6. System Physiology – Plant
The function of light is to excite a specialized chlorophyll in the reaction centre either by Direct absorption or more frequently, via energy transfer from an antenna pigment, This excitation process can be envisioned as
a.) An electron from the lowest-energy filled orbital of the chlorophyll to the highest-energy unfilled orbital
b.) An electron in the upper orbital is only tightly bound to the chlorophyll and is difficult to fetch the electron nearby molecules
c.) The electron in the upper orbital is only loosely bound to the chlorophyll and is easily lost if a molecule that can accept the electron is nearby
d.) The promotion of an electron from the highest-energy filled orbital of the chlorophyll to the lowest-energy unfilled orbital
Which combination is CORRECT?