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Plasma membrane is best described as a fluid mosaic model?
Yes, the plasma membrane is best described as a fluid mosaic model because it consists of a fluid lipid bilayer with embedded proteins that can move laterally within the membrane. This fluidity allows for flexibility and dynamic interactions between the membrane components.
Do eukaryotic plasma membranes contain cholesterol which makes the membrane more stable?
Yes, it does make the membrane more stable because the cholesterol is wedged into the bilayer squeezing it and stabilizing the phospholipid and keeping the membrane fluid below 37 degrees celcius.
Ribosomes stud the surface of rough endoplasmic reticulum true or false?
True. Ribosomes stud the surface of rough endoplasmic reticulum.
Is this true or false Osmosis is the process by which molecules tend to move from an area of higher concentration to an area of lower concentration?
True. Osmosis is the process by which solvent molecules (usually water) move across a semi-permeable membrane from an area of higher concentration to an area of lower concentration in order to equalize the concentration on both sides of the membrane.
3 All nuclear radiation consists of charged particles true or false?
False, neutrons are not charged and gamma rays aren't charged particles.
True or false Ribosomes differ from other organelles in that they are membrane bound?
False. Ribosomes are not membrane-bound organelles. They are small, complex structures responsible for protein synthesis within the cell. They can be found free-floating in the cytoplasm or attached to the endoplasmic reticulum.
Is it true that the transport proteins span the cell membrane allowing the selectively permeable membrane to regulate which molecules enter an leave the cell?
false
Osmosis is the process by which molecules tend to move from an area of higher concentration to an area of lower concentration is this true or false?
True. Osmosis is the movement of solvent molecules (usually water) across a selectively permeable membrane from an area of higher concentration to an area of lower concentration to equalize the concentration on both sides of the membrane.
The nuclear membrane disintegrates during prophase true or false?
True. The nuclear membrane disintegrates during prophase of mitosis to allow the condensed chromosomes to be visible and function properly during cell division.
The cell membrane controls what goes in and out of the cell true or false?
True. The cell membrane is selectively permeable, meaning it regulates the movement of substances in and out of the cell to maintain internal balance and protect against harmful substances.
Plasma membrane is best described as a fluid mosaic model?
Yes, the plasma membrane is best described as a fluid mosaic model because it consists of a fluid lipid bilayer with embedded proteins that can move laterally within the membrane. This fluidity allows for flexibility and dynamic interactions between the membrane components.
True or False Do Ribosomes carry out lipid synthesis?
False. Ribosomes do not carry out lipid synthesis. Lipid synthesis occurs in the endoplasmic reticulum and other organelles within the cell. Ribosomes are responsible for protein synthesis.
Are membranes selectively permeable if they allow only certain substances to move across them?
False.
True or false The cell membrane is selectively permeable?
True. The cell membrane is selectively permeable, meaning it allows certain substances to pass through while blocking others based on size, charge, and other criteria. This property is essential for controlling the movement of molecules in and out of the cell to maintain cellular homeostasis.
Do protists have a distinct nucleus that is separated from the cytoplasm by the nuclear membrane?
Yes, protists have a distinct nucleus that is separated from the cytoplasm by a nuclear membrane. This feature distinguishes them from prokaryotic organisms, which lack a true nucleus. The nucleus of protists contains their genetic material and controls cellular activities.
The assembly of ribosomes begins in a small dense structure called the chromatin true or false?
False. The assembly of ribosomes begins in a small dense structure called the nucleolus, not the chromatin.
Do eukaryotic plasma membranes contain cholesterol which makes the membrane more stable?
Yes, it does make the membrane more stable because the cholesterol is wedged into the bilayer squeezing it and stabilizing the phospholipid and keeping the membrane fluid below 37 degrees celcius.
