Master NEET Zoology with topic-wise questions. Tailored for NEET students, these questions strengthen your Biology preparation.
A researcher observes a unicellular organism reproducing asexually. The daughter cells are genetically identical except for a few minor variations. Which mechanism is MOST likely responsible for these variations?
Crossing over during mitosis
Independent assortment of chromosomes
Random mutations during DNA replication
Conjugation with another individual
Which type of evolutionary evidence relies on comparing the DNA sequences of different organisms?
Fossil evidence
Anatomical evidence
Molecular evidence
Biogeographical evidence
How does chronic inflammation contribute to cancer development?
By suppressing the immune system's ability to recognize and eliminate cancer cells.
By increasing blood flow to the tumor, providing nutrients for growth.
By releasing reactive oxygen species that can damage DNA and promote mutations.
By decreasing cell turnover, allowing mutated cells to accumulate.
A researcher is developing a DNA vaccine against a viral infection. Which of the following is NOT a crucial consideration for the effectiveness of this vaccine?
The efficient delivery of the DNA plasmid into host cells.
The expression of viral antigens by host cells.
The activation of both humoral and cell-mediated immune responses.
The inclusion of viral-like particles to enhance antigen presentation.
A primary spermatocyte with 2n = 46 chromosomes undergoes meiosis. At the end of Meiosis I, what is the chromosome number and DNA content of each resulting cell?
23 chromosomes and 4C DNA content
23 chromosomes and 2C DNA content
46 chromosomes and 4C DNA content
46 chromosomes and 2C DNA content
Which of the following describes a gene?
A segment of DNA that codes for a specific trait
A chromosome
An allele
A protein
Which statement about the comparison of mitosis and meiosis is FALSE?
Mitosis results in two diploid cells, while meiosis results in four haploid cells.
Mitosis involves one cell division, while meiosis involves two.
Mitosis produces genetically identical cells, while meiosis produces genetically diverse cells.
Homologous chromosomes behave similarly in mitosis and meiosis.
Which process is NOT directly involved in the growth and repair of damaged tissues in multicellular organisms?
Mitosis
Meiosis
DNA Replication
Protein Synthesis
Which of the following statements accurately describes the process of DNA replication?
It is a conservative process where the original DNA molecule remains intact.
It involves RNA polymerase and occurs in the 3' to 5' direction.
It is a random process with no specific enzyme involvement.
It is a semi-conservative process involving DNA polymerase.
