What is the structure of the large polytene chromosomes found in some tissues of dipteran larvae?
What will be an ideal response?
Ans: Polytene chromosomes are multiple replications of a single diploid pair that remain attached as many parallel fibers. The darker bands are more tightly condensed.
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In the above figure, which letter points to the testis?
A) A B) B C) C D) D E) E
Most plants are firmly rooted in place and are not mobile. Which of the following is not an adaptation to this condition?
A. growth by mitosis B. the presence of hairs, spines, and toxins C. the ability to survive long periods of unfavorable conditions D. cell walls
Eukaryotic mitochondria have their own 70S ribosomes and circular DNA.
Answer the following statement true (T) or false (F)
Each antibody molecule consists of
A) two light and two heavy protein chains. B) one light and one heavy protein chain. C) a "heavy" protein chain. D) a "light" protein chain. E) various combinations of light and heavy protein chains.