Question

Which of the following would NOT be a constituent of a plasma membrane? Select one: a. messenger RNA b. phospholipids c. glycoproteins d. glycolipids

Answer 1

Messenger RNA (mRNA) is not a part of the plasma membrane; instead, the membrane is primarily composed of phospholipids, glycoproteins, and glycolipids.

Step-by-step explanation:

The constituent that would NOT be a part of a plasma membrane is messenger RNA (mRNA). The plasma membrane is mainly composed of phospholipids, which form a bilayer, as well as glycoproteins and glycolipids that play key roles in cell recognition and signaling. Messenger RNA, however, is not embedded in the plasma membrane; rather, it is a molecule that carries genetic information from the DNA to the ribosome, where it guides protein synthesis.

Regarding the review questions provided as reference, they reinforce the understanding that phospholipids are crucial components of the plasma membrane, as they form the bilayer structure. Ion channels are examples of integral proteins because they are embedded within the membrane. The nucleus is the cellular structure surrounded by two phospholipid bilayers. These details all contribute to the overall comprehension of plasma membrane composition and function.

Answer 2

The correct answer is a. messenger RNA

Step-by-step explanation:

The plasma membrane mainly contains lipids, proteins, and carbohydrates. Phospholipids make the bilayer of the plasma membrane. Carbohydrates can be found attached to proteins and lipids.

The carbohydrates that are attached to lipids are called phospholipids and those with proteins are called glycoproteins. mRNA is the molecule which is not the part of the plasma membrane. mRNA is produced in the nucleus through the transcription process and is responsible for proteins formation.

So phospholipids, glycolipids, and glycoproteins are the part of the plasma membrane but not messenger RNA.