Question

1)

QUESTION 13

1. Which one of these things must be true for a reversible protein interaction with a ligand to occur?

   		The protein and ligand must have the same overall shape.
   		Functional groups of protein and ligand must be positioned to allow noncovalent bonding.
   		The protein cannot be composed of more than one subunit.
   		The protein and ligand must have the same overall electrical charge.

2. New phospholipid molecules are added to only one monolayer of a membrane but eventually are distributed randomly to both monolayers by _______________.

   		scramblases in the endoplasmic reticulum
   		interactions of phospholipid molecules with proteins in the cell cortex
   		floppases in the Golgi
   		repulsion of phospholipid head groups by water molecules inside and outside the cell

3. Which one of these structures would be found in a bacterial cell but not in an animal, plant, or fungal cell?

   		Chloroplast
   		Nucleoid
   		Centrosome
   		Vacuole

Answer 1

1. Which one of these things must be true for a reversible protein interaction with a ligand to occur?

   A reversible interaction between such requires to avoid covalent bonds, then the answer it: Functional groups of protein and ligand must be positioned to allow noncovalent bonding

2. New phospholipid molecules are added to only one monolayer of a membrane but eventually are distributed randomly to both monolayers by _______________.

   Membrane is synthesized in the smooth endoplasmic reticulum, it uses specific enzymes for this, the answer is: scramblases in the endoplasmic reticulum

3. Which one of these structures would be found in a bacterial cell but not in an animal, plant, or fungal cell?

The answer is nucleoid, it is the space in the bacteria that contains the genome material, it is not present in the eukaryotic cells because they have a true nucleus instead