Please send me the question in 20 minutes it's very urgent plz find both questions than rating helpful 27. While culturing some cells, you lower the temperature of the culture. What happensimmediately to the membrane fluidity?A. Nothing happens.B. The membrane becomes less fluid.C. The membrane becomes more fluid.D. The membrane fluidity fluctuates back and forth from high to low.28. Why do cells lack membrane transport proteins for O₂?A. Because they need to keep the oxygen concentration low inside the reducing environment ofthe cell.B. Because oxygen can dissolve in water and leak in via water channels.C. Because oxygen can dissolve in the lipid bilayer and diffuse in and out rapidly without theneed for a transporter.D. Because oxygen is transported in and out of the cell in special oxygen-carrying proteins suchas hemoglobin.

Answered: 27. While culturing some cells, you…

Biochemistry

9th Edition

ISBN:9781319114671

Author:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Publisher:Lubert Stryer, Jeremy M. Berg, John L. Tymoczko, Gregory J. Gatto Jr.

Chapter1: Biochemistry: An Evolving Science

Section: Chapter Questions

Problem 1P

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Please send me the question in 20 minutes it's very urgent plz find both questions than rating helpful

27. While culturing some cells, you lower the temperature of the culture. What happens
immediately to the membrane fluidity?
A. Nothing happens.
B. The membrane becomes less fluid.
C. The membrane becomes more fluid.
D. The membrane fluidity fluctuates back and forth from high to low.
28. Why do cells lack membrane transport proteins for O₂?
A. Because they need to keep the oxygen concentration low inside the reducing environment of
the cell.
B. Because oxygen can dissolve in water and leak in via water channels.
C. Because oxygen can dissolve in the lipid bilayer and diffuse in and out rapidly without the
need for a transporter.
D. Because oxygen is transported in and out of the cell in special oxygen-carrying proteins such
as hemoglobin.

Expert Solution

Step 1

Cell membrane are composed of lipid bilayer and proteins. Membrane fluidity depends on the content of lipid and proteins are responsible for cell signaling and transport. Unsaturated lipids increases the membrane fluidity because of low melting temperature.

Transport of biomolecules across the cell membrane can occur by diffusion, transport or channel proteins. It can be divided into two major category - passive transport (no energy molecule is required) and active transport (energy molecule is required).