81. The mitochondrial DNA is _____.
A. ss, linear.
B. ds, circular.
C. ss, circular.
D. none of the above.
ANSWER: C
82. The expression of genes is highly possible in the presence of _______.
A. promoters.
B. terminators.
C. suppressors.
D. inhibitors.
ANSWER: A
83. Virus infections of crops may result in retarded cell division is referred to as ________.
A. hyperplasia.
B. hypoplasia.
C. necrosis.
D. all the above.
ANSWER: B
84. Virus infections of crops may result in excessive cell division is referred to as _______.
A. hyperplasia.
B. hypoplasia.
C. necrosis.
D. endometrial hyperplasia.
ANSWER: A
85. Virus infections of crops may result in cell death is referred to as _______.
A. atypical hyperplasia.
B. hypoplasia.
C. necrosis.
D. endometrial hyperplasia.
ANSWER: C
86. Increased genetic diversity following extended time in a tissue culture is called _______.
A. gene alteration.
B. temporal modification.
C. somaclonal variation.
D. culture shock.
ANSWER: C
87. An undifferentiated mass of cells in a plant tissue culture is called _________.
A. shield.
B. callus.
C. somatic embryoid.
D. cell aggregate.
ANSWER: B
88. The best choice is culture to produce plants that are homozygous for all traits is ________.
A. anther.
B. axillary shoots.
C. bud.
D. meristem.
ANSWER: A
89. The culture used in plant tissue culture as a chemical factory for vitamins is _______.
A. suspension.
B. callus.
C. organ.
D. anther.
ANSWER: A
90. A characteristic feature of the chloroplast genome is the presence of two ________.
A. simple tandem arrays.
B. repeat interspersions.
C. compound tandem arrays.
D. identical inverted repeats.
ANSWER: D
