Approximately what percentage of the known biodiversity on Earth is composed of plants?
A. 6-8%
B. 50-55%
C. 16-19%
D. 63-67%
E. 12-15%
Answer: C
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Which of the following is the most important assumption for the mark-recapture method to estimate the size of wildlife populations?
A) All females in the population have the same litter size. B) More individuals emigrate from, as opposed to immigrate into, a population. C) Over 50% of the marked individuals need to be trapped during the recapture phase. D) There is a 50:50 ratio of males to females in the population before and after trapping and recapture. E) Marked individuals have the same probability of being recaptured as unmarked individuals during the recapture phase.
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?
Which of the following statements about the fast block to polyspermy is FALSE?
a. It occurs within seconds after fertilization. b. It involves a wave of electrical depolarization that spreads over the egg surface. c. It is not mediated by Ca2+ ions. d. It is more pronounced in vertebrates than in invertebrates. e. It is more pronounced in invertebrates than in vertebrates.
Most microorganisms on Earth can only live and survive in habitats that are similar to human body conditions.
Answer the following statement true (T) or false (F)