Prepare for NEET with Botany-specific practice questions. Covering all major Botany chapters, this is perfect for your NEET Biology needs.
A C4 plant exhibiting high stomatal conductance in response to elevated atmospheric CO2 experiences a sudden drop in CO2 levels. Which of the following is the MOST likely immediate consequence regarding the transpiration and photosynthesis compromise?
Increased transpiration and decreased photosynthetic rate
Decreased transpiration and increased photosynthetic rate
Decreased transpiration and decreased photosynthetic rate
No significant change in either transpiration or photosynthetic rate
A researcher observes that a plant species exhibits a lower transpiration rate and higher water use efficiency (WUE) under high light intensity compared to low light. Which physiological adaptation BEST explains this observation?
Increased leaf thickness
Deeper root system
Increased chlorophyll content
Partial stomatal closure
Which of the following is NOT a direct consequence of root pressure?
Exudation of water droplets from hydathodes
Upward movement of water in the xylem
Opening and closing of stomata
Development of positive pressure in the xylem
Which of the following is NOT a factor affecting the rate of osmosis?
The concentration gradient of water across the membrane
The temperature of the solutions
The permeability of the membrane to water
The amount of solute that can dissolve in the solvent
A 55-year-old male presents with progressive dyspnea, cough, and weight loss. A chest X-ray reveals bilateral hilar lymphadenopathy and interstitial infiltrates. Bronchoscopy with transbronchial biopsy shows non-caseating granulomas. Which of the following is the MOST likely diagnosis?
Sarcoidosis
Tuberculosis
Hypersensitivity pneumonitis
Lymphoma
A patient with chronic kidney disease on hemodialysis develops severe muscle cramps and weakness. ECG shows prolonged QT interval. Which electrolyte abnormality is MOST likely responsible for these findings?
Hypocalcemia
Hyperkalemia
Hypokalemia
Hypermagnesemia
During the production of genetically engineered human insulin, which of the following is NOT a critical step in ensuring the correct formation of disulfide bonds essential for the protein's biological activity?
Correct protein folding
Oxidation of cysteine residues
Cleavage of the proinsulin molecule
Glycosylation of the protein
A transgenic mouse expressing a human growth hormone gene exhibits gigantism. Researchers discover a second transgenic mouse line with the same human growth hormone gene construct, yet these mice show normal growth. Which of the following is the MOST LIKELY explanation for this discrepancy?
The second mouse line has a mutation in the mouse growth hormone receptor gene.
The human growth hormone gene is not being transcribed in the second mouse line.
Position effect variegation due to the transgene's insertion site in the second mouse line.
The second mouse line expresses an endogenous inhibitor of human growth hormone.
Knockout mice lacking the gene for PrP (prion protein cellular form) are resistant to prion diseases. What can be directly concluded from this observation?
PrP is sufficient to cause prion diseases.
PrP is the infectious agent in prion diseases.
PrP is necessary for the development of prion diseases.
The absence of PrP enhances the immune response against prions.
A transgenic animal is created by inserting a gene for enhanced muscle growth into its genome. However, the resulting offspring show a variety of phenotypes, some with significantly enhanced muscle growth, others with moderate enhancement, and some with no change at all. Which phenomenon is MOST likely responsible for this phenotypic variation?
Incomplete penetrance of the transgene
Pleiotropic effects of the transgene
Variable transgene copy number and integration sites
Epigenetic silencing of the transgene in some individuals
