Explain how chondrules form and how we know they exist
What will be an ideal response?
Most types of chondrites also contain chondrules, small round bits of glassy rock only a few millimeters across. To be glassy rather than crystalline, the chondrules must have cooled from a molten state quickly, within a few hours. One hypothesis is that chondrules are bits of matter from the inner part of the solar nebula, near the Sun, that were blown outward by winds or jets to cooler parts of the nebula where they condensed and were later incorporated into larger rocks. Another hypothesis is that the chondrules were once solid bits of matter that were melted by shock waves spreading through the solar nebula and then resolidified.
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A new mRNA can pass through the pores of the nuclear membrane into the cytoplasm only if ________
a. it has been phosphorylated b. it has been processed c. motor proteins attach to a base sequence and link the molecule to cytoskeletal elements d. proteins attach to a base sequence near the poly-A tail and temporarily block translation
Ionic compounds
A. always form salts in solution. B. are hydrophobic. C. are basic in solution. D. are hydrophilic. E. are acidic in solution.
Which type of learning occurs during a genetically determined time period, early in life?
a. instinct b. imprinting c. conditioned learning d. habituation e. imitative learning
Some of the largest leaves in the world can be found on plants near the forest floor of dense tropical rain forests. Which of the following precursors for photosynthesis is most likely limited in these large leaves?
A) oxygen B) carbon dioxide C) glucose D) light