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How does oxygen pass from alveoli into blood? Is this process passive, like osmosis, or is the membrane active? That is, does it resemble cell membranes, where the integrated membrane proteins are actively transporting chemicals?
During the inhalation, we inhale the atmospheric air which contains not only the molecular oxygen but nitrogen and several other gases. In alveoli, oxygen has a greater concentration than it...
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How does the Hubble Space Telescope take pictures? How long does it take it to take one photo?
The beautiful images that you find online are mainly from the Advanced Camera for Surveys or ACS. This camera can take pictures with four different filters to capture the different...
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What is the important function of mitosis in plants?
The mitosis cell division helps in vegetative growth in plants. It also helps in healing of wounds. The vegetatively reproducing plants reproduce by mitosis. Thank you
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Why does mitosis take place?
Mitosis ensures that all the cells will have same number of chromosomes. It is important for the formation of new cells and maintaining the ploidy of the cells as the...
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Which of these correctly distinguishes mitosis from meiosis?
A) Mitosis occurs in germ cells and meiosis occurs in somatic cells.
B) Crossing over takes place in mitosis and not in meiotic cell division.
C) Meiosis produces four 2N daughter cells; mitos
Recall that somatic cells are body cells excluding the reproductive cells. For example, this includes cells of the liver, skin, stomach, but not of sperm or the human egg. In...
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After animal regeneration (a form of asexual reproduction), does the original animal still exist? Or, as in mitosis, does the parent organism no longer exist?
This question reminds me of Plutarch's "Ship of Theseus" from "Lives of the noble Grecians and Romans": The ship wherein Theseus and the youth of Athens returned had thirty...
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What types of plants use a C4 pathway, where would you find these plants?
C4 plants are adapted to situations in which the stomata of the leaves (the pores required for gas exchange) are partially closed during the day. This happens at high temperatures...
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How does cellular respiration take place in plants?
The cellular respiration is similar in plants and animals. The site of this cellular respiration is mitochondria. Glycolysis, Krebs Cycle, ETS are found in all the cases, where cellular...
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What are the differences between non vascular plants, seedless vascular plants and seed plants?
Vascular budles bearing plants such as Pteridopyjta, Gymnosperm and Angiosperm are vascualr plants. In the vascular plants water and food materials are tranferred from the vascular bundles to all parts...
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Why would it take more energy to take 2 electrons from an atom of sodium than it does t take 3 electrons from an atom of aluminum?
$"Aluminum, Z = 13"$, with an electronic configuration of $1s^(2)2s^(2)2p^(6)3s^(2)3p^1$, versus $"Natrium, Z = 11":$ $1s^(2)2s^(2)2p^(6)3s^(1)$ . The second electron removed from the sodium atom is removed from an inner...
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