One hypothesis that has been proposed regarding the origin of life suggests that life evolved from an "RNA world" to today's "DNA world
" Considering the properties of RNA and DNA molecules, which questions would direct an investigation of the most insightful test(s) of this hypothesis? A) Is it likely that RNA molecules functioned as ribozymes to synthesize DNA from amino acids, and that this role was reversed when DNA became the information source?
B) Is it likely that simple, yet stable RNA molecules served as a primitive precursor to a less stable DNA molecule that was more capable of storing more information?
C) Could RNA have provided a template for DNA assembly, thereby enabling a more stable molecule that is replicated more accurately?
D) Since ribozymes could freely enter and leave the vesicles, could these molecules have brought external DNA into the cell as a less stable, but more reliable storage molecule of double-stranded DNA?
C
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Early in Earth's history, there was a massive "supercontinent" known as ____
a. Gondwana b. Pangea c. Botswana d. Pellagra e. Panagra
Which of the following statements regarding food is false?
A) Food provides the raw materials for biosynthetic pathways that make molecules for cellular repair and growth. B) Food provides the raw materials for biosynthetic pathways that can produce molecules that are not actually present in the original food. C) Food provides the raw materials for biosynthetic pathways that can produce sugar by a process that is the exact opposite of glycolysis. D) Food provides the raw materials for biosynthetic pathways that consume ATP.
A diagnostic sign of measles are (herpangina/Koplik's spots/macules) in the mouth
What will be an ideal response?
Chromosomes uncoil and new nuclei form during:
A) telophase. B) anaphase. C) prophase. D) metaphase.