The building blocks of DNA are.
A. genes.
B. double helices.
C. amino acids.
D. nucleotides.
E. chromosomes.
D. nucleotides.
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Petals
A. protect the developing flower. B. enclose and protect the ovule. C. produce pollen. D. are part of the gametophyte. E. attract pollinators.
As the period of fetal growth comes to an end, a steep rise in ____ levels directly causes ____
a. progesterone; uterine cells to express oxytocin receptor genes b. progesterone; uterine contractions c. estrogen; uterine cells to express oxytocin receptor genes d. estrogen; uterine contractions e. estrogen; oxytocin production
Which terms accurately reflect the nature of replication of the chromosome in E. coli?
A) unidirectional and fixed point of initiation B) bidirectional and fixed point of initiation C) bidirectional and multirepliconic D) multirepliconic and telomeric E) unidirectional and reciprocal
A research laboratory is attempting to collect the content of human red blood cells. The type of solution researchers should use to cause blood cells to lyse (burst) would be
A. osmotic. B. hypoosmotic. C. isosmotic. D. hyperosmotic.