Most cell membranes are composed principally of ?

1. 1. Protein and Chitin
   2. DNA ad protein
   3. Protein and Lipids
   4. Protein and RNA

Which of the following endoplasmic reticulum has no ribosome on its surface?

1. 1. rough
   2. smooth
   3. both
   4. None of these

Who was first to propose an objective definition of instinct?

1. 1. Kohler
   2. Thorpe
   3. Pavlov
   4. Darwin

Vocal cords are stretched across_____.

1. 1. Pharynx
   2. Glottis
   3. Larynx
   4. All of these

The radial symmetry is found in the animals of _____.

1. 1. Cnidaria
   2. Porifera
   3. Protozoa
   4. None of these

Villi and microvilli increase _____.

1. 1. digestion
   2. absorption
   3. assimilation
   4. blood pressure

Reflex actions below the neck are under control of _____.

1. 1. Brain
   2. Hypothalamus
   3. Spinal cord
   4. All of these

Which of the following is present in the underground parts of the plants and stored food?

1. 1. stem
   2. leucoplast
   3. chromoplast
   4. chloroplast

Ribosomes and DNA are also present in _____.

1. 1. endoplasmic reticulum
   2. mitochondria
   3. golgi complex
   4. lysosomes

Ribosomal RNA (rRNA) constitutes _____ of the total cellular RNA.

1. 1. 10-20%
   2. 80%
   3. 3-4 %
   4. 90%