Practice free Zoology NEET multiple-choice questions online with instant answers and detailed explanations. No login required.
It is responsible for beginning of the life of organisms
The zygote is the initial cell formed when two gamete cells are joined by means of sexual reproduction. It is responsible for the beginning of the life of organisms as it undergoes multiple cell divisions and differentiation to form a complete organism.
Who proposed that new cells arise through cell division of pre-existing cells
Rudolf Virchow proposed that new cells arise through the division of pre-existing cells. This concept is a fundamental principle of cell theory.
It is the smallest cell
Mycoplasma is known to be the smallest living cell. It lacks a cell wall and can survive without oxygen. Bacteria, yeast, and blue-green algae are larger in comparison.
The association of more than one ribosome with a single molecule of m-RNA complex is called as
A polysome, or polyribosome, is a cluster of ribosomes bound to an mRNA molecule. This structure allows for the simultaneous translation of a single mRNA by multiple ribosomes, enhancing protein synthesis efficiency.
In mitochondria, it contains F-particles
F-particles, also known as ATP synthase particles, are located on the cristae of mitochondria. These enzyme complexes are crucial for ATP production during oxidative phosphorylation.
Microfilaments are made up of
Microfilaments are primarily composed of actin, which is a type of protein. Actin filaments are part of the cytoskeleton and play a key role in maintaining the cell's shape, enabling cellular movements, and participating in various cellular processes.
It directs formation of the bipolar spindle during cell division
The centriole is the organelle that directs the formation of the bipolar spindle during cell division. Centrioles are cylindrical structures that help in the organization of microtubules in the spindle apparatus, which is essential for the segregation of chromosomes during mitosis and meiosis.
In human which cell lacks nucleus
Red Blood Cells (RBCs) in humans lack a nucleus. During their maturation, RBCs lose their nucleus to provide more space for hemoglobin, which allows them to efficiently transport oxygen throughout the body.
In each chromosome centromere possessing disc shaped structure is
The kinetochore is a protein structure on the centromere that serves as the attachment point for spindle fibers during cell division. It is disc-shaped and plays a critical role in the proper segregation of chromosomes. The centromere itself holds the sister chromatids together.
Bacteria possess small DNA other than circular DNA which is called as
Bacteria often contain small, circular DNA molecules known as plasmids, which are separate from the main bacterial chromosome. Plasmids can replicate independently and often carry genes that confer advantageous traits, such as antibiotic resistance.
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