Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
Certain histone modifications are associated with actively transcribed genes. Which of the following combinations is MOST likely to be found in the nucleosomes of such genes?
Methylation of H3K9 and H3K27; Deacetylation of H3 and H4
Phosphorylation of H2AX; Trimethylation of H3K9
Acetylation of H3 and H4; Trimethylation of H3K4
Ubiquitination of H2A; Trimethylation of H3K27
Certain fungi exhibit a unique phenomenon called heterokaryosis. Which statement BEST describes its significance?
It represents a diploid stage in the fungal life cycle, crucial for sexual reproduction.
It results in the formation of dikaryotic hyphae, ensuring genetic uniformity within the mycelium.
It allows for the coexistence of genetically different nuclei within a single mycelium, potentially leading to novel genetic combinations.
It triggers the formation of resistant spores, aiding in survival under unfavorable conditions.
The genetic material distribution in daughter cells produced by amitosis, compared to the parent cell, is generally:
Exactly identical
Significantly different
Randomly distributed with no predictable pattern
Approximately equal but not necessarily identical
One potential disadvantage of amitosis compared to mitosis is:
Slower cell division rate
Increased energy expenditure
Increased risk of unequal distribution of genetic material
Formation of a complex spindle apparatus
Which statement best describes the genetic outcome of amitosis?
Genetic material is equally distributed to daughter cells
Genetic material is distributed, but not necessarily equally
Genetic material is not replicated before division
Genetic recombination occurs
The stable change in the plant brought about by vernalisation is believed to be:
Genetic
Physiological
Epigenetic
Morphological
A bacterial strain has a mutation in the gene encoding DNA gyrase. Which antibiotic would likely be ineffective against this strain?
Penicillin
Tetracycline
Ciprofloxacin
Erythromycin
Certain apomictic plants produce seeds without fertilization. How would the genetic makeup of the endosperm in such a plant likely differ from a sexually reproducing angiosperm?
It would be genetically identical to the maternal tissue.
It would be a mixture of maternal and paternal genes.
It would be entirely paternal in origin.
It would be haploid.
A chromosome with its centromere located precisely in the middle, dividing it into two arms of equal length, is classified as:
Telocentric
Metacentric
Acrocentric
Submetacentric
