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 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.
A researcher isolates chromatin fibers and treats them with a nuclease that specifically cleaves linker DNA. Following this treatment, what would be the approximate size distribution of the DNA fragments observed?
Approximately 200 bp
Approximately 1000 bp
Approximately 50 bp
A wide range of sizes from 200 bp to several thousand bp
Polytene chromosomes, found in certain insect tissues, exhibit distinct banding patterns. These bands represent:
Individual genes arranged linearly along the chromosome.
Regions of heterochromatin exclusively.
Regions where DNA replication has been halted prematurely.
Regions of highly condensed chromatin corresponding to inactive genes interspersed with less condensed regions of active genes.
In an experiment, a researcher selectively removes histone H4 from chromatin. Which of the following is the MOST likely immediate consequence?
Increased condensation of the chromatin fiber.
Enhanced binding of RNA polymerase to promoter regions.
Specific activation of a subset of genes.
Significant destabilization of the nucleosome core and loss of DNA wrapping.
Histone proteins are rich in which of the following amino acids?
Lysine and Arginine
Glycine and Alanine
Tryptophan and Phenylalanine
Cysteine and Methionine
Approximately how many base pairs of DNA are wrapped around a single nucleosome core?
200
50
146
250
Which of the following is NOT a characteristic of a prokaryotic cell?
Presence of a cell wall
Presence of ribosomes
Presence of membrane-bound organelles
Presence of a nucleoid region
Which of the following is NOT a characteristic of a eukaryotic cell?
Presence of a nucleus
Presence of membrane-bound organelles
Larger size compared to prokaryotic cells
Lack of membrane-bound organelles
