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monitta
3 years ago
8

Explain why vestigial organs are not “left-overs” of evolution (3 points)

Biology
1 answer:
nasty-shy [4]3 years ago
3 0

<u>Answer</u>:

Vestigial organs are those organs that were present in the past ancestors but absent in their present generations. Vestigial organs are not leftover of evolution because they are evolved to perform a different function.

<u>Explanation</u>:

For example, an appendix is considered as a vestigial organ but it helps in storing good bacteria and plays a vital role in the immune system. These vestigial organs are the product of changing the environment and adaptation to the changing environment. Due to natural selection some specific traits have been passed down to generations which helped the animals to survive in those conditions. The other examples of vestigial organs are wisdom teeth coccyx, tonsils, several genes in the chromosomes and our hair.                

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What stage of respiration immediately follows the process depicted below? Two pyruvate molecules undergo a chemical reaction, co
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Answer:

Electron transport chain

Explanation:

Cellular respiration is the process whereby glucose is broken down in the cell to yield energy in form of ATP. This process, which is important to the metabolic functioning of every organism, occurs in three major stages namely: glycolysis, kreb's cycle and electron transport chain (ETC).

According to this question, a stage of respiration is described as follows:

- Two pyruvate molecules undergo a chemical reaction, combining with coenzyme A to form two acetyl-CoA molecules.

- Two carbon dioxide molecules and two NADH molecules are formed as a result of this process.

The process depicted above is KREB'S CYCLE of cellular respiration, hence, the stage of respiration that immediately follows the process is called ELECTRON TRANSPORT CHAIN (ETC).

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3 years ago
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C. Lactic acid fermentation
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Explain the difference between blood types AB and O.
blsea [12.9K]

Answer:

The difference between AB and O blood types has to do with the antigens you have or don’t have on your red blood cells.

AB blood has both A and B antigens on its red blood cells and

O blood has neither A nor B antigens on its red blood cells

Explanation:

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3 years ago
Which processes are involved in the chloroplast of a plant cell?
Ahat [919]

Answer:

Chloroplast absorbs sunlight and it is used to make feed for the plant together with water and carbon dioxide gas. Chloroplasts are used to generate the free energy stored in ATP and NADPH via a photosynthesis process.

Explanation:

The site of photosynthesis action is chloroplast within a plant cell consisting of two chlorophyll molecules (PS1 and PS2), which have been embedded in the thylakoid membranes. The chloroplast consists of two chlorophyll molecules (photosynthetic pigments responsible for the green color of chloroplast). Each chlorophyll molecule absorbs light, caused to depart the chlorophyll molecules. This absorbs two electrons from each phenotype. PS2 electrons pass through the transportation chain for electron carriers, a series of redox reactions that release the energy used to synthesize ATP via Photophosphorylation/Chemiosmose (as the H+ ions diffuse through the stalked particles ATP, which changes the shape and catalysts, the electrochemical gradient diffuses down through the stalky particle ATP synthase).

Then these electrons replace the electrons lost in PS1. PS2 electron is replaced by photolysis electron, which when light strikes chloroplast, splitting the water into oxygen gas, H+ ions, and electron enzymes in the thylakoid space are catalyzed. The PS1 electrons combine to create NADPH with H+ ions and NADP (reduced NADP). These are the light-dependent photosynthetic reactions in chloroplasts. In the light-independent reactions, the NADPH and ATP are created. A pile of thylakoids is known as granum.

The light-independent processes take happen in the stroma. This is the site of carbon fixation; CO2 reacts with RUBP to generate GP (glycerate-3-phosphate) which is catalyzed by the enzyme RUBISCO (the most abundant enzyme in the world) (the most abundant enzyme in the world). The NADPH and ATP from the light-dependent processes convert GP to GALP (glyceraldehyde 3-phosphate). Two out of every 12 GALP molecules produced are used to synthesize glucose that can be employed either in breathing or in cellulose-forming condensation polymerization to add extra strength to the planted cell wall. The other GALP molecules are returned to RUBP.

7 0
2 years ago
(WILL MARK BRAINLIEST AND THANK YOU!) **EXTRA POINTS**
liberstina [14]

Answer:

This structure provides support and protection for plant cells = Cell Wall

This is a large, central fluid-filled structure that provides turgidity = Vacuole

A thin semipermeable barrier around the cell which regulates what enters and leaves the cell = Cell membrane

The control center of the cell = Nucleus

It is often described as the cells Power Plant = Mitochondria

This is used by plant cells for photosynthesis = Chloroplast

Hope this helps :)

Plz mark Brainliest :D

Explanation:

The giant blue thing is the vacuole

The thin yellow line is the cell membrane

The yellow and orange ball is the nucleus

The light green thing with zig zag lines is the mitochondria

The dark green thing inside the cell is the chloroplast

The thing outside the cell is the cell wall its green

6 0
3 years ago
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