(Q).
Q: What is composed of two strands of nucleotides in a double-helical structure? Choices: - molecule - RNA - bacteria - dna A:
(A).
dna

(Q).
Q: What is the most important source of energy on earth? Choices: - the earth's core - water - moon - sun A:
(A).
sun

(Q).
Q: Reversing the orientation of a chromosomal segment is called what? Choices: - spontaneous mutation - occurrences - volatiles - inversions A:
(A).
inversions