Where do most ferns grow and house their spores?
a) on their rhizoids
b) on their fronds
c) on their antheridia
d) on their gametophyte
e) on their prothallus
Answer: b) on their fronds
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In a sporophyte of an angiosperm, growth occurs at ________ via ________
A) meristems… mitosis B) meristems… meiosis C) flowers… fertilization D) seeds… dispersal
Solution that is equal in solute concentration to that of the cytoplasm of a cell; causes cell to neither lose nor gain water by osmosis.
What will be an ideal response?
Sometimes, the most practical way to do an experiment is not to perform it in an animal, but to look at cell responses in culture. Cells from mice, humans, and other mammals have been used to establish cell culture lines that have been very important for research. You are studying a novel water-soluble mouse hormone. You know cell culture can be a practical model to reveal protein function, so you apply the hormone to yeast cells, but nothing happens. How could you improve your experiment?
A. Hydrolyze the hormone before application. B. Add ATP as a cofactor. C. Apply the hormone to mouse cell culture. D. Apply the hormone at a concentration of 0.5 M.
A forest community is made up of thousand of species of organisms and can exist practically unchanged for hundreds of years. This stability is due to the
a. diversity of organism present b. abundance of insects that feed on plants c. changes in the climate of the area d. lack of decomposers in the forest