What allows a sperm to penetrate an egg during fertilization?
a. The egg has receptors for the sperm to bind to allows for passage through the membrane.
b. The sperm sends out a signal and the egg brings the sperm inside via phagocytosis.
c. Enzymes within the acrosome allow the sperm and egg plasma membranes to fuse.
d. The egg recognizes the sperm and degenerates the zona pellucida.
c. Enzymes within the acrosome allow the sperm and egg plasma membranes to fuse.
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Enzymes function to:
A. regulate messages between cells. B. transport molecules and ions across membranes. C. catalyze chemical reactions. D. react with other enzymes to form a product.
Which organisms represent the common ancestor of all photosynthetic plastids found in eukaryotes?
A) autotrophic euglenids B) diatoms C) dinoflagellates D) red algae E) cyanobacteria
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What will be an ideal response?
How might you choose a region of DNA for a PCR primer so as to increase the temperature necessary for primer annealing (to minimize nonspecific PCR products)?
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