Fibroblast cells are a good model system for studying muscle differentiation because
A. they are totipotent.
B. they never differentiate into muscle cells in a normally developing animal.
C. they have a small genome.
D. they can differentiate into muscle cells in a normally developing animal.
E. they express a limited number of genes.
Answer: B
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If all of the collagen were removed from a bone, how would the properties of that bone be altered?
A. The bone would be more brittle and easier to break. B. The bone would be more flexible. C. The bone would be harder to break. D. The bone would be more flexible and harder to break. E. The bone would be indistinguishable from cartilage.
Alexander Fleming kept finding mold contamination that was killing his bacterial cultures. This observation eventually lead to the development of the antibiotic penicillin. Why would a fungus produce a compound that is selectively toxic to bacteria?
A. Fungi eat bacteria. B. Fungi are killed by bacterial toxins. C. Fungi compete with bacteria for resources. D. Killing bacteria is an accident. Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about fungi and bacteria? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Flattened sacs of internal membranes associated with photosynthesis are called
A. cristae. B. chloroplasts. C. thylakoids. D. photosystems. E. the stroma.
Pair the ribosomal structure with the correct organism.
A. Eukaryote B. Bacteria C. Archaea