UGCA Cell Organelle/Membrane/Communication Discussion

Which of the following organelles are LEAST likely to be involved in protein synthesis?

• Smooth ER

• Nucleus

• Golgi Aparatus

• Rough ER

According to the Fluid Mosaic Model, the cell membrane is....

• a rigid structure that prevents movement of molecules between it

• comprised solely of phospholipids

• a fluid and dynamic lipid bilayer with an array of proteins

• a loose membrane that permits transport of genetic material

Which molecule will have the easiest time passing through the Cell Membrane by itself?

• 
• 
• 
• 

Tay-Sachs disease causes a lipid-digesting enzyme to be inactive or missing. What organelle (or
organelles) would be most affected by such a disease?

• Mitochondria

• Nucleus

• Lysosome

• Endoplasmic Reticulum

What is happening to the cell at (2)?

• Large amounts of positively charged ions enter the cell

• Negatively charged ions exit the cell

• The Cell lyses

• Sodium-Potassium pump rebuilds the electrical gradient

The Sodium-Potassium pump creates a negative charge within the cell membrane by moving ___ out and ___ into the cell.

• proteins

  lipids

• 3 Na+

  2 K+

• 3 K+

  1 Br-

• water

  sugar

Which of the following about Cell Membrane Transport are false?

• Carrier proteins ALL perform active transport

• Aquaporins are channel proteins that facilitate water diffusion

• Secondary Active Transport pair transport of a solute downhill, with another uphill

• Facilitated transport is a form of passive transport aided by proteins

Which of these regarding Cell Evolution is False?

• In-folding of cell membranes gives more surface area for reactions

• The nucleus is the only organelle with a double-membrane

• Aerobic bacterium were engulfed before photosynthetic bacterium

• Mitochondria and Chloroplasts divide independent of the cell

Tags

NGSS.HS-LS4-2

What is TRUE about the Signal Transduction Pathway?

• Reception of a ligand can ONLY take place at the cell membrane

• Phosphorylation cascades can amplify an initial signal thousands times over

• Protein Phosphatase phosphorylates Protein Kinases

• Responses to the Signal Transduction pathway is limited to gene expression

What triggers an Action Potential in Neurons?

• Nonpolar Hormones bind to intracellular receptors

• Detection of viral antibodies

• Ion Channels open, allowing Sodium to rush into the neuron

• A light switch