Cells conserve energy and resources by making active proteins only when they are needed. If a protein is not needed, which of the following methods of control would be the most energy efficient?
A. block transcription
B. degrade the mRNA after it is made
C. degrade the protein after it is made
D. prevent translation of the mRNA
Answer: A
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The cyst form of Balantidium coli is the infective stage. It has one large kidney-shaped macronucleus and one small, round micronucleus. The troph is quite large, measuring 50 to 150 µm in length and 40 to 70 µm in width. What single feature is associated with this organism?
a. Falling leaf motility b. Shepherd's crook c. Presence of oocytes d. Cilia covering the troph
Which term best describes the concept that molten rock emanates from the edge of a plate on the Earth's crust, pushing rock on the other side into a trench?
a. the theory of uniformity b. plate tectonics c. hot spots d. fault line rupture e. biogeography
Organisms that use photosynthesis to capture energy and make their own organic compounds are known as producers or ____________________.
Fill in the blank(s) with the appropriate word(s).
Identify two ways in which posttranscriptional gene regulation occurs in eukaryotes and briefly explain each What will be an ideal response?