Each of the following is true about basal lamina except
A) it serves as a structural support.
B) it allows for movement of some small molecules but blocks movement of large molecules.
C) it can influence cell migrations in certain areas of the body.
D) it contains collagen type IV, proteoglycans, laminins, and entactin.
E) it is composed primarily of fibronectin.
Answer: E
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As a microbiologist you have been asked to investigate the regulation of a novel gene in a bacterial species. Given what is known about bacteria, the logical place to begin your investigation is
A. transcriptional regulation. B. translational regulation. C. alternative splicing regulation. D. regulation by enhancer elements. E. regulation by general transcription factors. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain and what do they mean? Gather Content · What do you already know about gene regulation in bacteria? Consider Possibilities · Consider the different answer options. Which can you rule out? Choose Answer · Given what you now know, what information and/or problem solving approach 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?
Which of the following is not a characteristic of an autosomal dominant disorder pedigree?
A. Two unaffected parents will not have affected children. B. Heterozygotes are affected. C. Affected children will usually have unaffected parents. D. Two affected parents can produce an unaffected child. E. Both males and females are affected with equal frequency.
Enzyme molecules require a specific shape to perform their catalytic function. Which of the following might alter the shape of an enzymatic protein?
A. denaturing the protein B. a change in salt concentrations or pH C. heating the protein D. mixing in a chemical that removes hydrogen bonds E. all of the above
A clear area against a confluent "lawn" of bacteria is called a
A) phage. B) pock. C) cell lysis. D) plaque. E) rash.