In the first step in oogenesis
A) a primary oocyte divides to form a secondary oocyte and a first polar body.
B) an oogonium accumulates cytoplasm and DNA replicates.
C) a stem cell divides to yield an oogonium and a spermatogonium.
D) an oocyte divides to yield two polar bodies.
B) an oogonium accumulates cytoplasm and DNA replicates.
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Which of the following is most directly responsible for driving ATP synthase and the production of ATP in cellular respiration?
A. The electron transport chain pumping H+ from the mitochondrial matrix into the intermembrane space. B. The flow of electrons down the electron transport chain. C. The loss in free energy that occurs as an electron moves down the transport chain. D. The H+ electrochemical gradient across the inner mitochondria membrane. E. The ability of oxygen to rapidly capture an electron and energize ATP synthase.
Reconstructions of the evolutionary relationships of a set of taxa are called
A) classifications. B) phylogenetic trees. C) UPGMA networks. D) networks. E) evolutionary scenarios.
Cytoplasmic projections called ________ enable certain kinds of protists to move from place to place
a. plasmodesmata b. pseudopods c. flagella d. cilia e. trichomes
A couple has two female children. What is the probability that their next child will be male?
A) 25% B) 50% C) 33% D) 67%