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

NEET-2021 Cell-Cycle-and-Cell-Division [class-xi ]

• Leptotene
• Zygotene
• Diakinesis
• Pachytene
Correct Option: C  [ Diakinesis ]

Remark:

The centriole undergoes duplication during:

NEET-2021 Cell-Cycle-and-Cell-Division [class-xi ]

• S-phase
• Prophase
• Metaphase
• G₂ phase
Correct Option: A  [ S-phase ]

Remark:

Succus entericus is referred to as:

NEET-2021 Digestion-and-Absorption [class-xi ]

• Pancreatic juice
• Intestinal juice
• Gastric juice
• Chyme
Correct Option: B  [ Intestinal juice ]

Remark:

Sphincter of oddi is present at:

NEET-2021 Digestion-and-Absorption [class-xi ]

• Ileo-caecal junction
• Junction of hepato-pancreatic duct and duodenum
• Gastro-oesophageal junction
• Junction of jejunum and duodenum
Correct Option: B  [ Junction of hepato-pancreatic duct and duodenum ]

Remark:

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

NEET-2021 Breathing-and-Exchange-of-Gases [class-xi ]

• pO₂ = 104 and pCO₂ = 40
• pO₂ = 40 and pCO₂ = 45
• pO₂ = 95 and pCO₂ = 40
• pO₂ = 159 and pCO₂ = 0.3
Correct Option: A  [ pO₂ = 104 and pCO₂ = 40 ]

Remark:

Select the favourable conditions required for the formation of oxyhaemoglobin at the alveoli.

NEET-2021 Breathing-and-Exchange-of-Gases [class-xi ]

• High pO₂, low pCO₂, less H⁺, lower temperature
• Low pO₂, high pCO₂, more H⁺, higher temperature
• High pO₂, high pCO₂, less H⁺, higher temperature
• Low pO₂, low pCO₂, more H⁺, higher temperature
Correct Option: A  [ High pO₂, low pCO₂, less H⁺, lower temperature ]

Remark:

Which enzyme is responsible for the conversion of inactive fibrinogens to fibrins?

NEET-2021 Body-Fluids-and-Circulation [class-xi ]

• Thrombin
• Renin
• Epinephrine
• Thrombokinase
Correct Option: A  [ Thrombin ]

Remark:

Persons with 'AB' blood group are called as "Universal recipients". This is due to:

NEET-2021 Body-Fluids-and-Circulation [class-xi ]

• Absence of antigens A and B on the surface of RBCs
• Absence of antigens A and B in plasma
• Presence of antibodies, anti-A and anti-B, on RBCs
• Absence of antibodies, anti-A and anti-B, in plasma
Correct Option: D  [ Absence of antibodies, anti-A and anti-B, in plasma ]

Remark:

Chronic auto immune disorder affecting neuro muscular junction leading to fatigue, weakening and paralysis of skeletal muscle is called as:

NEET-2021 Locomotion-and-Movement [class-xi ]

• Arthritis
• Muscular dystrophy
• Myasthenia gravis
• Gout
Correct Option: C  [ Myasthenia gravis ]

Remark:

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

NEET-2021 Chemical-Coordination-and-Integration [class-xi ]

• Alpha cells of pancreas
• The cells of rostral adenohypophysis
• The cells of bone marrow
• Juxtaglomerular cells of the kidney
Correct Option: D  [ Juxtaglomerular cells of the kidney ]

Remark: