Biology today

1. 
   

   The sequence of nitrogenous bases in one strand of DNA
   are 3′ TAC GCG ACG 5′. The complementary DNA strand
   should have
   (a) 5 ′ AUG CGC TGC 3′ (b) 3 ′ ATG CGC TGC 5′
   (c) 5 ′ UAC GCG ACG 3′ (d) 5 ′ ATG CGC TGC 3′

   
   


2. 
   

   Match the entries in Column I with those of Column II and
   choose the correct answer.
   Column I Column II
   A. Restriction endo- (i) Kohler and Milstein
   nucleases
   B. Polymerase chain (ii) Alec Jeffreys
   reaction
   C. DNA fingerprinting (iii) Arber
   D. Monoclonal antibodies (iv) Kary Mullis
   (a) A-(iii), B-(iv), C-(ii), D-(i)
   (b) A-(iii), B-(ii), C-(iv), D-(i)
   (c) A-(ii), B-(iii), C-(iv), D-(i)
   (d) A-(ii), B-(iv), C-(iii), D -(ii)

   
   


3. 
   

   Match Column I with Column II and select the correct option.
   Column I Column II
   A. Ascomycetes (i) Ustilago
   B. Phycomycetes (ii) Saccharomyces
   C. Basidiomycetes (iii) Trichoderma
   D. Deuteromycetes (iv) Albugo
   (a) A-(ii), B-(i), C-(iv), D-(iii) (b) A-(iv), B-(iii), C-(ii), D-(i)
   (c) A-(ii), B-(iv), C-(i), D-(iii) (d) A-(iii), B-(iv), C-(i),D-(ii)

   
   


4. 
   

   Given below is a simplified model of phosphorus cycling in
   a terrestrial ecosystem with four blanks (A-D). Identify the
   blanks.
   Consumers

   
   

A

Soil solutions

B

D

C

Uptake

Run off

A B C D

(a) Rock

minerals

Detritus Litter fall Producers

(b) Litter fall Producers Rock minerals Detritus

(c) Detritus Rock

minerals

Producers Litter fall

(d) Producers Litter fall Rock minerals Detritus

5. Match the microbial products listed under Column I with
   the related microbes given under Column II. Choose the
   appropriate option from the given choices.
   Column I Column II
   A. Citric acid (i) Methanobacterium
   B. Cyclosporin A (ii) Monascus purpureus
   C. Statin (iii) Aspergillus niger
   D. Gobar gas (iv) Trichoderma
   polysporum
   (v) Clostridium butylicum
   (a) A-(ii); B-(iv);C-(v); D-(iii)
   (b) A-(iii);B-(iv);C-(ii); D-(i)
   (c) A-(iii);B-(iv);C-(ii); D-(v)
   (d) A-(v); B-(ii); C-(iv);D-(iii)


6. During which phase(s) of cell cycle, amount of DNA in a cell
   remains at 4C level if the initial amount is denoted as 2C?
   (a) G 0 and G 1 (b) G 1 and S
   (c) G 2 (d) G 2 and M


7. Match the following and choose the correct combination
   from the options given.
   Column I Column II
   Chemical compounds Example
   A. Nitrogen base (i) RNA
   B. Nucleoside (ii) Thymidylic acid
   C. Nucleotide (iii) Cytidine
   D. Nucleic acid (iv) Uracil