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Karo-lina-s [1.5K]
3 years ago
9

Why can't we see chloroplasts in onion cells even though they have them?

Biology
1 answer:
sergejj [24]3 years ago
7 0
 <span>Because the chloroplasts that actually photosynthesize are found in the tops of the onions - the part that is actually above ground. There's no reason for there to be chlorophyll in the onion skin itself because these grow underground :)</span>
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The predatory bacterium Bdellovibrio bacteriovorus is able to penetrate a gram-negative bacterium that has a slimy cell covering
jek_recluse [69]

Answer:

The order of bacterial structures that the bacteria would penetrate would be:

  1. Capsule.
  2. Lipopolysaccharide Membrane
  3. peptidoglycan
  4. Phospholipids Membrane.

Explanation:

A parasite like B. bacteriovorus faces some challenges in getting into a bacterial cell. This is because these cells have devices and strategies to prevent the entry of parasites and ensure the survival of the bacteria. The first challenge would be to penetrate the bacterial capsule. The capsule is a structure that is located around many bacteria. This structure is rigid, with sharp edges and thick thickness, which protects the bacteria from external agents. If B. bacteriovorus manages to go beyond the capsule, it will find a membrane, also thick, composed mainly of lipopolysaccharides, which will also provide protection and try to prevent the entry of the parasite. If this membrane is crossed, B. bacteriovorus will face another layer called peptidoglycan. This layer establishes itself as a cell wall, being very difficult to break. Some bacteria present one more layer after peptidoglycan, which is a membrane made by Phospholipids, which is highly selective and difficult to break, but is more fragile than the previous layers. Only after overcoming all these structures, the parasite will have access to the bacterial cel

6 0
3 years ago
18. Describe the relationship between photosynthesis and respiration. Use the word equations for each reaction.
galben [10]
<span>The link between photosynthesis and cellular respiration is an inverse relationship, both are opposites of each other. Photosynthesis is the process by which carbon dioxide is converted into organic compounds from sunlight. The most frequent compound is sugar. Photosynthesis occurs in plants, algae, and some bacteria. Cellular respiration, in contrast, takes glucose (sugar) and other organic compounds oxidizing them to create carbon dioxide. Each cycle depends on one another in order for the "entire cycle" to take place. The completed cycle ensures life continues to exist on the planet. Both are necessary for living organisms.

I am hoping that this answer has satisfied your query and it will be able to help you in your endeavor, and if you would like, feel free to ask another question.

</span>
5 0
3 years ago
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30. One cause of muscle soreness is
xenn [34]

Answer:

c. lactic acid fermentation

Explanation:

If we did alcoholic fermentation, working out would make us feel drunk, not sore. This is only done by yeasts (a type of fungus) and bacteria. Glycolysis is simply an anaerobic process that occurs with fermentation and also regular aerobic respiration. It doesn't cause any soreness on its own. The Krebs cycle is the second major part to cellular respiration; it produces 6 NADH's, 2 FADH2's, 4 CO2's and 2 ATP; it's not involved in creating any soreness, as cell respiration does not create soreness. That leaves lactic acid fermentation, which we, bacteria, yeasts, and other organisms do. This is what we do when we run out of ample oxygen while doing some strenuous activity. Glycolysis is done with it. Glycolysis, however, relies on NAD+ to create ATP we need to maintain the same level of activity, lactic acid is produced as it accepts the 2 electrons and [H+] NAD+  should accept.

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3 years ago
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What happens next after the hormone glucagon binds to a g-protein coupled receptor (gpcr)?
Natali5045456 [20]

Glucagon acts on the receptors of the liver cell. The gpcr include a internal signaling in the cell following the heterotrimeric G-proteins dissociates. It activates a pathway that results in the breakdown of glycogen to glucose or the de novo synthesis of glucose in the cells.






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Squamous cells are part of _____ tissue and are _____ shaped.
dalvyx [7]

the answer is option "A"

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3 years ago
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