During the development of an animal embryo, different tissue types like muscle and neurons will begin to form as the result of: cells changing from diploid to haploid because of meiosis segregation of specific chromosomes to daughter cells synthesis of messenger RNAs from different sets of genes mutations occurring that randomly activate genes for specific tissues crossing over forcing the expression of particular genes
During the development of an animal embryo, different tissue types like muscle and neurons will begin to form as the result of:
cells changing from diploid to haploid because of meiosis |
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segregation of specific chromosomes to daughter cells |
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synthesis of messenger RNAs from different sets of genes |
||
mutations occurring that randomly activate genes for specific tissues |
||
crossing over forcing the expression of particular genes |

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- The diagram depicts a double-layered structure representing the inner membrane space of mitochondria or the thylakoid membrane in chloroplasts.
- Protons (H⁺) are shown being pumped from side X to side Y, indicated by the large arrow in the center.
#### Proton Movement and Electron Transport
- **Side X and Side Y:** Represent the different sides of the membrane where protons accumulate and are pumped across.
- **Protons (H⁺):** Illustrated as circles with a plus sign, these are being actively transported across the membrane.
- **Large Arrow:** Symbolizes the direction of proton pumping.
#### Multiple-Choice Question
Which of the following could be correct about this ETC in either cellular respiration (CR) and/or photosynthesis (PS)?
1. ⭘ In CR, side X is the mitochondrial inter-membrane space.
2. ⭘ In PS, NADPH supplies the electrons that enter the chain.
3. ⭘ In CR, the electrons come to the chain from reactions of the citric acid cycle.
4. ⭘ In both PS and CR, the protons travel by facilitated diffusion.
5. ⭘ In PS, the electrons go immediately onto oxygen to make water.
#### Answer Key
- **Option 1:** In cellular respiration (CR), side X indeed could be the mitochondrial inter-membrane space.
- **Option 2:** In photosynthesis (PS), NADPH does not supply the electrons for the ETC; it acts as a product of the light-dependent reactions.
- **Option 3:** Correct. In CR, electrons do originate from the citric acid cycle.
- **Option 4:** Incorrect. Protons are actively transported, not by facilitated diffusion.
- **Option 5:** Incorrect. In PS, electrons do not go onto oxygen; this is specific to CR where oxygen acts as the final electron acceptor to form water.
By understanding the flow of protons and electrons within the electron transport chain, this diagram and the accompanying question help illustrate essential processes in both cellular respiration and photosynthesis.](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fdad6e660-8d7e-4d6e-9629-e3eb58a62841%2F6aa59942-14ef-43a4-962d-9a9784d72ff5%2Faktcd7p.png&w=3840&q=75)

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Development of an animal embryo starts with the process of fertilization of egg cell by a sperm cell. After the fertilization zygote undergoes the mitotic cell divisions and cellular differentiation that lead to the development of a multicellular animal embryo. The developing embryo is known as blastula. The dramatic rearrangement of the cells in blastula to create the embryonic tissue layers is known as gastrulation. These tissue layers later produce the tissues and organs of the animal.
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