Which of the following is NOT characteristic of RNA?
A) It is a helical polymer.
B) It is usually double-stranded.
C) Its "backbone" is composed of pentoses and phosphates.
D) It contains both purines and pyrimidines.
E) It can function as a catalyst.
B
Bloom's Taxonomy: Knowledge
Section: Organic Macromolecules
Learning Outcome: 2.27
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Cell–cell communication in plants takes place via specialized structures called
A) plasmodesmata. B) chloroplast outer membrane pores. C) gap junctions. D) lipid rafts. E) connexons.
If red flowers (R) is dominant over white flowers (r), plants with Rr ____
a. are homozygous dominant b. are homozygous recessive c. have red flowers d. have white flowers e. have pink flowers
Active genes in eukaryotic cells are associated with
A. heterochromatin. B. methylated RNA and histones. C. DNA with many methyl groups. D. euchromatin.
What event that occurred around 10,000 years ago led to genetic changes in wheat?
A) domestication of the wheat plant B) domestication of livestock C) invention of genetic engineering D) mass extinction of herbivores