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The partial pressures (in mm Hg) of oxygen (O2) and carbon dioxide (CO2) at alveoli (the site of diffusion) are:

a) pO2 = 159 and pCO2 = 0.3 b) pO2 = 104 and pCO2 = 40 c) pO2 = 40 and pCO2 = 45 d) pO2 = 95 and pCO2 = 40 Answer: b) pO2 = 104 and pCO2 = 40... View Article

Which stage of meiotic prophase shows terminalisation of chiasmata as its distinctive feature?

a) Leptotene b) Zygotene c) Pachytene d) Diakinesis Answer: d) Diakinesis... View Article

Succus entericus is referred to as

a) Pancreatic juice b) Gastric juice c) Intestinal juice d) Chyme Answer: c) Intestinal juice... View Article

Which of the following characteristics is incorrect with respect to cockroach?

a) Hypopharynx lies within the cavity enclosed by the mouth parts b) A ring of gastric caeca is present at the junction of midgut and hind gut... View Article

Erythropoietin hormone which stimulates R.B.C. formation is produced by:

a) Juxtaglomerular cells of the kidney b) The cells of bone marrow c) Alpha cells of pancreas d) The cells of rostral adenohypophysis... View Article

In some members of which of the following pairs of families, pollen grains retain their viability for months after release?

a) Rosaceae ; Leguminosae b) Poaceae ; Leguminosae c) Poaceae ; Solanaceae d) Poaceae ; Rosaceae Answer: a) Rosaceae ; Leguminosae... View Article

In the exponential growth equation Nt = No ert, e represents

a) The base of number logarithms b) The base of exponential logarithms c) The base of geometric logarithms d) The base of natural logarithms... View Article

DNA fingerprinting involves identifying differences in some specific regions in DNA sequence, called as

a) Satellite DNA b) Single nucleotides c) Repetitive DNA d) Polymorphic DNA Answer: c) Repetitive DNA... View Article

Plasmid pBR322 has Pstl restriction enzyme site within gene ampR that confers ampicillin resistance. If this enzyme is used for inserting a gene for β-galactoside production and the recombinant plasmid is inserted in an E.coli strain

a) It will lead to lysis of host cell b) It will not be able to confer ampicillin resistance to the host cell c) It will be able to produce a... View Article

What is the role of RNA polymerase III in the process of transcription in eukaryotes?

a) Transcribes rRNAs (28S, 18S and 5.8S) b) Transcribes precursor of mRNA c) Transcribes tRNA, 5s rRNA and snRNA d) Transcribes only snRNAs... View Article

Amensalism can be represented as:

a) Species A (+); Species B (+) b) Species A (–); Species B (0) c) Species A (–); Species B (–) d) Species A (+); Species... View Article

Mutations in plant cells can be induced by:

a) Kinetin b) Infrared rays c) Zeatin d) Gamma rays Answer: d) Gamma rays... View Article

Genera like Selaginella and salvinia produce two kinds of spores. Such plants are known as:

a) Heterosporous b) Heterosorus c) Homosporous d) Homosorus Answer: a) Heterosporous... View Article

Which of the following algae contains mannitol as reserve food material?

a) Gracilaria b) Ectocarpus c) Volvox d) Ulothrix Answer: b) Ectocarpus... View Article

A typical angiosperm embryo sac at maturity is:

a) 7-nucleate and 8-celled b) 8-nucleate and 7-celled c) 7-nucleate and 7-celled d) 8-nucleate and 8-celled Answer: b) 8-nucleate and 7-celled... View Article

Which of the following is not an application of PCR (Polymerase Chain Reaction)?

a) Molecular diagnosis b) Gene amplification c) Detection of gene mutation d) Purification of isolated protein Answer: d) Purification of... View Article

In spite of interspecific competition in nature, which mechanism the competing species might have evolved for their survival?

a) Competitive release b) Resource partitioning c) Mutualism d) Predation Answer: b) Resource partitioning... View Article

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