Match each item in COLUMN I with one in COLUMN II and select your answer from the codes given:

	COLUMN I		COLUMN II
	SCIENTIST		CONTRIBUTION
A.	Francis Crick	a.	Breaking the genetic code
B.	Nirenberg	b.	Established Caenorhabditis elegans as a model genetics study organism
C.	Benzer	c.	Central dogma of molecular biology
D.	Brenner	d.	Bacteriophage genetics

Codes:
    A.    B.    C.     D.
1. c      a     d      b
2. c      a     b      d
3. a      b     c      d
4. a      c     d      b       

(1) Similar

(2) Identical

(3) Complementary

(4) Synergistic

(1) Complementary to each other                

(2) Identical to the parental DNA

(3) Similar to each other

(4) Complementary to the parental DNA

(1) Reverse transcriptase

(2) Teminism

(3) Ribozymes                                                

(4) Retroviruses

(1) A typical nucleus is not seen and DNA is scattered throughout the cell

(2) A typical nucleus may sometimes be present and DNA is scattered throughout a cell

(3) A typical nucleus is not seen but DNA is not scattered throughout the cell

(4) A typical nucleus may sometimes be present but DNA is not scattered throughout the cell

(1) Arginine and Lysine

(2) Argine and Leucine

(3) Arginine and Isoleucine                                

(4) Aspartate and Glutamate

1. 60 base pairs

2. 140 base pairs

3. 200 base pairs 

4. 400 base pairs

1. Are not required

2. Are required from the beginning to the end of packaging

3. Are required only for earlier stages of packaging

4. Are required for higher level of packaging

(1) DNA is the genetic material

(2) RNA can be the genetic material

(3) Sterptococcus has two strains

(4) Bacterial transformation

(1) Proteases

(2) RNase

(3) DNAs

(4) None of these