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

Biology & Microbiology

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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).

Biology & Microbiology

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

Biology & Microbiology

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?

Biology & Microbiology

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

Biology & Microbiology