121. Vapour phase nitrogen is used as a cryoprotectant at _____degree celsius.
A. -196.
B. -150.
C. -80.
D. -79.
ANSWER: B
122. . Slow freezing method of cryopreservation is done at _____ C/min.
A. 0.5-5.0.
B. b. 0.4-5.0.
C. 0.3-5.0.
D. 0.2-5.0.
ANSWER: A
123. Rapid freezing method of cryopreservation is done at _____ C/min.
A. -100 to -1000.
B. -200 to -1000.
C. -300 to -1000.
D. -400 to -1000.
ANSWER: C
124. Which one of the following is used as cryoprotectants?
A. DMSO.
B. Glycerol.
C. Ethylene.
D. All the above.
ANSWER: D
125. The transfer of desirable genes from one plant species to another is called as ___________ technology.
A. rDNA .
B. transgenic.
C. plant genetic transformation.
D. plant transformation.
ANSWER: C
126. What is the length of Ti plasmid?
A. 20kb.
B. 200kb.
C. 2kb.
D. 2000kb.
ANSWER: B
127. Which one of the following technique is mostly confined to protoplasts that can be regenerated to viable plants?
A. Electroporation.
B. Biolistic method.
C. Microinjection.
D. Silicon carbide fibres.
ANSWER: A
128. Opines are _______.
A. aminoacids.
B. lipids.
C. proteins.
D. nucleic acids.
ANSWER: A
129. The first clinical trials in humans, using a plant derived vaccine were conducted in _____.
A. 1987.
B. 1997.
C. 1977.
D. 1967.
ANSWER: B
130. The ingestion of transgenic potatoes is done by a toxin of _______.
A. E.coli.
B. Streptococcus sp.
C. Staphylococcus sp.
D. Bacillus sp.
ANSWER: A
