Which is a possible source of genetic variation during meiosis?
A. mitosis
B. crossing-over
C. DNA replication
D. protein synthesis
Ans: B. crossing-over
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In nitrification, electrons are donated to an electron transport chain from ammonia or from nitrite to be oxidized to ________, with ________ serving as the terminal electron acceptor.
Fill in the blank(s) with the appropriate word(s).
What does a photosystem consist of?
a. a photovoltaic cell and a chromatography center b. a light-harvesting complex and a reaction center c. a solar energy center and an NADPH complex d. an electron-harvesting complex and a thylakoid lumen
Sketch an exponential growth curve with correctly labeled axes. Identify two organisms and the conditions under
which they might demonstrate such growth. What will be an ideal response?
In a tide pool, a student encounters an organism with a hard outer covering that contains much calcium carbonate, an open circulatory system, and gills. The organism could potentially be a crab, a shrimp, a barnacle, or a bivalve
The presence of which of the following structures would allow for the most certain identification of the organism? A) a mantle B) a heart C) a body cavity D) a filter-feeding apparatus