Which of the following are responsible for the detection of changes in environment?

1. 1. Receptors
   2. Neurons
   3. Effectors
   4. None of these

Purine and pyrimidine metabolism results in production of_____.

1. 1. Creatinine
   2. Xanthine
   3. Trimethyamine oxide
   4. All of these

Light reaction takes place on/in_____.

1. 1. Thylakoid
   2. Grana
   3. Storma
   4. Chloroplast

Trisomy 21 is most common in mothers of the _____age group.

1. 1. 40 to 45
   2. 15 to 19
   3. 20 to 34
   4. 35 to 39

Which of the following cytoplasmic extensions carry the message toward the cell body_____.

1. 1. Axon
   2. Dendrites
   3. Both of these
   4. All of these

Which of the following is the quality of improved transgenic basmati rice?

1. 1. Gives high yield but no characteristic aroma
   2. Does not require chemical fertilizers and growth hormones
   3. Resistant to insects and diseases
   4. Gives high yield and is rich in vitamin A

The ?rst antibiotic to be discovered was_____.

1. 1. Penicillin
   2. Cephalosporin
   3. Amino glycosides
   4. Erythromycin

A smallest contractile unit of muscle contraction called sarcomere is the area between two_____.

1. 1. H- zone
   2. Z- Line
   3. M- Line
   4. A band

Arterial blood contains _____of CO2 per 100 ml of blood

1. 1. 54 ml
   2. 60 ml
   3. 50 ml
   4. 64 ml

Metabolism of photosynthesis and respiration involves the knowledge of_____.

1. 1. Biochemistry
   2. Biotechnology
   3. Chemistry
   4. Genetic engineering