Lecture : Reproduction strategies

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lxsaantony

13 Jan 2023

School

Philadelphia University

Department

Biology

Course

BIOL-103L

Professor

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Document Summary

Aquatic fertilisation (eggs placed in water- fish, amphibia) is a primitive method of fertilisation. Gases are exchanged from and to water across a membrane. Because of the high mortality rate, there are a lot of eggs. The placenta facilitates physiological exchange (nutrients, gases, and excretory products, for example). Hormone production is a process that involves the production of hormones. During pregnancy, the placenta and membranes protect the embryo/foetus and provide for: All formed zygote amnion, chorion, allantois and yolk sac. The foetal chorion and maternal endometrium combine to produce the placenta. After the foetus is born, the umbilical cord, placenta, amnion, and chorion are ejected as "afterbirth. " The inner cell mass (embryoblast) is responsible for the formation of the embryo. The outer cell mass (trophoblast) is a component of the placenta. The walls of maternal capillaries are eroded by syncytiotrophoblast cells.

Related Questions

11. Synthesis of ATP using the energy released as a proton diffuses down a concentration gradient involves the conversion of concentration gradient energy into chemical energyâTrue or false?

12. In the absence of active transport of a molecule, a simple or facilitated diffusion of the molecule will result in an equilibrium of the molecule across the membraneâTrue or false?

13. In the absence of an active transport of a molecule, a simple or facilitated diffusion of the molecule across a membrane will result in zero energy available to do workâTrue or false?

14. If biological membranes were permeable to all solutes osmosis could not occur because the concentration of water will be same on both sides of the membraneâTrue or false?

ceruleanfox820

1. predict the direction of water movement based on differences in solute concentrations. Use the terms osmotic pressure, hypotonic, isotonic, and hypertonic
2. Why do membranes have to be selectively permeable?

3. What determines whether a particular substance can diffuse (simple or facilitated) through a membrane?

4. What mechanisms drive molecules across membranes? Use the terms concentration gradient, (facilitated) diffusion and active transport.
5. Which parts of the plasma membrane proteins do you expect to be hydrophobic or hydrophilic? Justify your answer.
concise and short answers pls

Substances can move across the membrane via simple diffusion, facilitated diffusion, or active transport.

	Where does it occur in membrance?	Does it require transport protein?	Does it require input of energy?
Simple diffusion
Facilitated diffusion
Actove transport

a. What functions might each of the three types of diffusion serve in an independent cell like a Paramecium or an amoeba?

b. What functions might each of the three types of diffusion serve in a multicellular organism---for example, a human or a tree?

c. What would you need to observe or measure to determine whether a substance was moved across a membrane via each type of diffusion?

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Lecture : Reproduction strategies

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