Which of the following is true of the actinomycetes?
A. Some are photosynthetic.
B. They closely resemble the fungi in morphology.
C. They divide by budding.
D. They are unique among prokaryotes in producing sexual spores.
Answer: B
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Which of the following is true about membrane filters?
A. It can't be depended on to remove all viruses from liquids. B. It does not truly sterilize because it removes rather than kills microorganisms. C. It can be used only to remove organisms from liquids and it does not truly sterilize because it removes rather than kills microorganisms. D. It can be used only to remove organisms from liquids.
Why can't you use mitochondrial DNA to distinguish between these two suspects?
You are a forensic technician working on a DNA sample obtained from a crime scene. Your job is to compare the unknown DNA sample with known DNA samples collected from five different suspects. Preliminary analysis using only a few DNA markers revealed that the unknown sample could possibly match two of the suspects. After consulting the case file, you find out that these two suspects are brothers (but not twins). You realize that you will have to do a more detailed analysis on the samples so that you can distinguish between the brothers and determine which brothers' DNA matches the unknown sample. A. The sequence of mitochondrial DNA has not yet been determined. B. The brothers share the same mitochondrial DNA. C. There are no molecular techniques available that allow one to analyze mitochondrial DNA. D. Because mitochondrial DNA is inherited in a paternal pattern. Clarify Question · What is the key concept addressed by the question? · What type of thinking is required? · What key words does the question contain? Gather Content · What do you already know about mitochondrial DNA? 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?
A patent for a DNA sequence would be deemed to have substantive utility if it ________
A) showed what the DNA sequence coded for B) showed a real-world use for the DNA sequence C) showed the nucleotide sequence of the DNA D) showed the protein sequence of the DNA E) showed that the DNA sequence was found in other organisms
You are a virologist interested in studying the evolution of viral genomes. You are studying two newly isolated viral strains and have sequenced their genomes. You find that the genome of strain 1 contains 25% A, 55% G, 20% C, and 10% T
You report that you have isolated a virus with a single-stranded DNA genome. Based on what evidence can you make this conclusion? (a) single-stranded genomes always have a large percentage of purines (b) using the formula: G – A = C + T (c) Double-stranded genomes have equal amounts of A and T (d) Single-stranded genomes have a higher rate of mutation