BIOLOGY MIDDLE SCHOOL

What causes a certain trait?

Answers

Answer 1
Answer:

Answer:

It's in Your Genes.

Some traits are controlled by genes passed from parent to child, others are acquired through learning but most are influenced by a combination of genes and environmental factors.

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What does a pulley consist of

Answers

Look at the picture i provided, hope this helps! :)
A simple machine- includes a wheel with a grooved rim where a rope or chain can run to change the direction of the pull and lift a load.

Which characteristic do ferns have that mosses do not?

Answers

ferns are pointy and mosses is not!

The noble gases are stable because they have how many electrons in their outer energy level?2
4
6
or 8

Answers

Noble gases are the least reactive of all known elements. That's because with eight valence electrons, their outer energy levels are full. The only exception is helium, which has just two electrons. Noble gases are gaseous elements; Including , neon , argon, krypton xenon and radon. These gases belong to the group 0 (18) of the periodic table. I hope this helps 

If i show a dominant trait do one of my parents have to show the same trait? explain?​

Answers

well, not exactly like some parents have blue eyes and they have a dominant brown eyed child. This can happen because of the gynotype. The history of the child’s parents probably have some brown eyes which caused the child to have brown eyes. But usually the parent does express a dominant trait like the child.

Explain in detail the function of the circulatory system and why it is inportant

Answers

the circulatory system has the organs and tissues. it has the blood flow through the body and delivers nutrients to the organs and tissues.

5. What molecule is essential to regenerate at the end of the Krebs cycle to start the process again?A. Water
B. Pyruvate
C. Oxaloacetate
D. Ammonia

Answers

Answer: Oxaloacetate

Explanation: The krebs cycle starts with the pyruvic acid that is obtained after glycolysis. The Kreb's cycle begins when the Acetyl coA combines with a four molecule oxaloacetate.

The main product formed is citric acid thats why the cycle is also called as citric acid cycle. After the citric acid is formed it goes through a series of reactions to form NADH, FADH2 and ATP.

The carbon dioxide is also released during this process. The oxaloacetate formed is used to start the cycle so its is regenerated again and again.

Oxaloacetate is the molecule that is essential to regenerate at the end of the Kreb's cycle to start the process again.

Further Explanation;

Cellular respiration;

  • Cellular respiration is the process by which living organisms use nutrients or food substances to generate energy in the form of ATP that is required to drive cellular processes.
  • Cellular respiration takes place in three stages; glycolysis, Kreb's cycle and electron transport.

Glycolysis

  • It is the first stage of aerobic respiration where an organic molecule such as glucose is broken down to form 2 molecules of Acetyl-CoA and net production of 2 ATP molecules.
  • Each glucose molecule yields two molecules of ATP and two molecules of Acetyl-CoA.
  • During the process of glycolysis 2 molecules of energy carrier, NADH which are then taken to energy transport chain to produce more ATP.

Kreb's cycle

  • It is the second phase of aerobic respiration that involves a series of reactions catalyzed by various enzymes.
  • Acetyl-CoA from glycolysis undergoes a series of reaction to produce six molecules of NADH, two molecules of FADH2, together with carbon dioxide and two molecules of ATP.
  • During Kreb's cycle Acetyl-CoA is converted to Citrate to Isocitrate to alpha-ketoglutarate to Succinyl-CoA to Succinate to Fumarate to malate and lastly to Oxaloacetate.
  • Oxaloacetate is the final molecule formed during the TCA cycle and is essential to enhance the start of Kreb's cycle once more.

Electron transport chain

  • It is the final stage of Aerobic respiration, where the six molecules of NADH and two molecules of FADH2 from Kreb's cycle and 2 NADH molecules from glycolysis are used to generate more energy in the form of ATP.
  • This stage generates 34 molecules of ATP.  
  • Keywords: Cellular respiration, energy carriers, energy in the form of ATP, use of energy carriers from glycolysis and citric acid cycle to generate more ATP.

Learn more about:

Level: High school

Subject: Biology

Topic: Cellular respiration

Sub-topic: Kreb's cycle

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