Depending on the mRNA sequence, amino acids are randomly inserted all along the protein. Indicate whether the statement is true or false
F
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Why is the poly-A tail added to mRNA before it leaves the nucleus?
a. It provides a destination for movement in the cell. b. It protects against exonuclease activity. c. It notifies the cell that this molecule is “self.” d. It provides the final instructions for protein synthesis.
In what ways does the cloned cat Cc demonstrate the limitations of cloning technology in obtaining desired phenotypes?
What will be an ideal response?
Plants maintain higher levels of phytochrome at their growing tips where phytochrome plays important roles in growth responses to light. Phytochrome levels are also high in areas of the plant that are "greening." What does this suggest about the role of phytochrome in these "greening" zones?
A. Phytochrome is facilitating the transcription and translation of photosynthesis related proteins. B. Phytochrome is absorbing green wavelengths of light. C. Phytochrome is facilitating the migration of chlorophyll pigments from other areas of the plant. D. In these areas, phytochrome is the first step in the electron transport chain of photosynthesis.
Which of the following demonstrates negative feedback by the endocrine system?
(A) During labor, the fetus exerts pressure on the uterine wall, inducing the production of oxytocin, which stimulates uterine wall contraction. The contractions cause the fetus to further push on the wall, increasing the production of oxytocin. (B) After a meal, blood glucose levels become elevated, stimulating beta cells of the pancreas to release insulin into the blood. Excess glucose is then converted to glycogen in the liver, reducing blood glucose levels. (C) At high elevation, atmospheric oxygen is more scarce. In response to signals that oxygen is low, the brain decreases an individual's rate of respiration to compensate for the difference. (D) A transcription factor binds to the regulatory region of a gene, blocking the binding of another transcription factor required for expression.