The AV node in the heart of man is
1. Pace maker
2. Pace setter
3. Purkinji fibres
4. Bundle of his

Select the mismatch :

1) Frankia – Alnus

2) Rhodospirillum – Mycorrhiza

3) Anabaena – Nitrogen fixer

4) Rhizobium – Alfalfa

Proteins are made from amino acids by the process of

1. hydrolysis
2. pinocytosis
3. active transport
4. dehydration synthesis

Smallest R.B.Cs in the following mammals are found in

1. Man
2. Musk deer
3. Rhinocros
4. Whale

The eggs of birds and reptiles are :
1. Cleidoic and Megalecithal
2. Noncleidoic and Macrolecithal
3. Cleidoic and Alecithal
4. Noncleidoic and Microlecithal

Chromosomes normally occur as homologous pairs in

1. a sperm cell
2. an egg cell
3. a zygote
4. a gamete

Which of the following cells do not have a nucleus?

 1) Sieve element
 2) Guard cells
 3) Companion cells
 4) Epidermal cells

The only plant cells without nuclei among the following are

1) Cambium cells
2) Xylem vessel elements
3) Root hair
4) Companion cells

In a eukaryotic cell which of the following RNA undergoes translation ?
1. r-RNA
2. t-RNA
3. m-RNA
4. all these three types

Which of the following is an egg laying mammal ?
1. Platypes
2. Otter
3. Seal
4. Walrus