What is the function of the E. coli proteins MreB, PBP2, and RodA?
What will be an ideal response?
Ans: They maintain the rodlike shape of the cell. Mutations in any one of their genes cause the cell to lose its extended shape and become round.
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In early forensic applications of DNA fingerprinting, DNA was extracted from crime scene material, digested with restriction enzymes, and then used to prepare a Southern blot. Today, polymerase chain reaction (PCR) is used in the early steps of forensic
DNA analysis. Which of the following is an advantage that PCR provides over the former method? A) PCR produces many more bands for fingerprint analysis, making it a more informative technique. B) PCR can cut DNA at many more sites than can restriction enzymes. C) PCR requires much less DNA for analysis. D) PCR can analyze DNA, proteins, and carbohydrates, whereas restriction enzyme analysis is limited to DNA.
Agave americana is a monocarpic plant (it has a single carpel). Once it flowers (reproduces), it dies
Although these plants can be very long-lived before flowering (10–30 years, on average), there is no continued growth after floral meristem replaces apical meristem tissues. The floral stalk can reach heights of more than 5 meters, and takes all the carbohydrate reserves of the plant. Based on your knowledge of plant growth and development, which of the following statements is a plausible explanation for death after flowering in A. americana? A. Once the floral meristem develops, auxin is no longer produced and only lateral meristems can grow. B. There are no lateral meristems in A. americana, so growth does not occur after flowering and the plant dies. C. There are no apical or lateral meristems in A. americana; the stalk only grows because of division and elongation of floral meristem. D. After flowering, an individual A. americana knows it has reproduced, so dies because it has ensured its inclusive fitness by contributing to the next generation.
Many cases of epigenetic modification involve adding a methyl group to the DNA in promoters, a process called ____________________
Fill in the blank(s) with correct word
Please match the specific immune response phase with the statements that most accurately describe them to test your understanding of the overall phases in a specific immune response.
Involves helper T cells and cytotoxic T cells A) Antigen-Independent Development B) Antigen Contract C) Humoral Immunity D) Cell-Mediated Immunity E) Antigen Presentation