Prepare for NEET Biology Cell: The Unit of Life with MCQs & PYQs on NEET.GUIDE. Enjoy free practice, previous year questions, and expert solutions to understand cell structure and function.
Which unique feature of prokaryotic DNA replication allows for rapid cell division?
Presence of introns
Single origin of replication
Linear chromosomes
Multiple replication forks
The presence of hopanoids in some prokaryotic plasma membranes primarily contributes to:
Protein synthesis
Nutrient transport
Membrane stability
Photosynthesis
Which statement BEST describes the relationship between the nuclear envelope and the endoplasmic reticulum?
The nuclear envelope is entirely separate from the endoplasmic reticulum.
The inner membrane of the nuclear envelope is continuous with the smooth ER membrane.
The outer membrane of the nuclear envelope is continuous with the rough ER membrane.
The nuclear envelope is formed by invaginations of the Golgi apparatus.
Histone H1 plays a crucial role in the structure of chromatin. Which of the following statements regarding its interaction and function is INCORRECT?
H1 binds to the linker DNA between nucleosomes.
H1 helps to compact chromatin structure.
H1 interacts with the core histones within the nucleosome octamer.
H1 stabilizes the interaction of DNA with the nucleosome.
Which of the following statements regarding the chemical composition of the secondary cell wall is INCORRECT?
It may contain lignin, suberin, or cutin.
It often has multiple layers, denoted as S1, S2, and S3.
It predominantly contains pectin and hemicellulose.
Cellulose microfibrils are arranged in a more parallel fashion compared to the primary wall.
Plasmodesmata are crucial for intercellular communication. Which component of the cell wall is specifically disrupted during plasmodesmata formation?
Secondary cell wall only
Primary cell wall only
Middle lamella only
Primary cell wall and middle lamella
Which enzymatic activity is primarily responsible for loosening the cell wall structure during cell expansion?
Cellulase
Pectin methylesterase
Expansin
Lignin peroxidase
The presence of which compound in the cell wall significantly contributes to the resistance of woody tissues to decay and compression?
Suberin
Cutin
Pectin
Lignin
Which of the following statements regarding the signal recognition particle (SRP) and its receptor is INCORRECT?
The SRP receptor is an integral membrane protein of the ER.
SRP binds to both the signal sequence and the ribosome, halting translation.
SRP guides the ribosome-mRNA complex to the ER membrane.
SRP binds to the nascent polypeptide chain only after it has completely emerged from the ribosome.
The cell membrane maintains a distinct phospholipid composition between its inner and outer leaflets. Which of the following transport mechanisms is primarily responsible for establishing and maintaining this asymmetry?
Simple diffusion
Facilitated diffusion
Flippases
Ion channels
