Biology

What are the macromolecules DNA and RNA referred to as?
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Natural selection favors copper tolerance in all soils near the old mine, not only in the contaminated soils. Nearly 100% of monkey flowers growing in copper-contaminated soil are copper tolerant. Copper contamination in the soil created copper-tolerant plants. 1. If you were to test monkey flowers growing on the shore of the lake, you would expect nearly 100% of them to be copper tolerant. 2. Copper-tolerant plants are found only in contaminated soils. 3. The population that existed before mining must have included both copper-tolerant and copper-intolerant plants.
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What does a model of the rock cycle show? a. the amount of earths carbon cannot be determined b. the amount of earths carbon increases c. the amount of earths carbon decreases d. the amount of earths carbon is constant
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What is the density of a liquid that has a volume of 20 mL and a mass of 3 g?
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What are the functions of the structures labeled X?
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There is a population of beetles that typically have black wings. A scientist studying these beetles knows that their eggs hatch in early spring, the young insects grow through the late spring and summer, they lay eggs in the early fall, and they die in the early winter. Recently some beetles have been born with white wings. Early in life, the black- and white-winged beetles seem to be very similar in number of mating events, eggs laid, and survival rates, but shortly after laying their eggs the white beetles die and there are only black-winged beetles during the late fall. What is a true statement about the beetles?
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Which type of star system is pictured?
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What cant pet DNA tests tell us about our pets?
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would you expect something with a pH of 4 to be more or less acidic than human blood?
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An ecological pyramid is sometimes used to show both the flow of matter and energy in an ecosystem. The pyramid narrows as matter and energy flow from the bottom to the top. Draw a conclusion about what this pyramid tells you about the energy in this ecosystem.
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A population of beetles are kept in a controlled ecosystem. No beetles areallowed to enter or leave. The graph below shows the population of beetles.Beetle PopulationPopulation sizeTimeWhich best describes the ecosystem at Point A?OA. The death rate is higher than the birthrate.OB. It has reached carrying capacity.OC. There is no competition for resources.OD. The population is decreasing,
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While doing field work in Madagascar, you discover a new dragonfly species that has either red(R) or clear(r) wings. Initial crosses indicate that R is dominant to r. You perform three crosses using three different sets of redwinged parents with unknown genotype and observe the following data:cross Phenotype 1 72 red-winged,24 clear-winged 2 54 red-wing,49 clear-wing 3 96 red-wingedWhat is the most likely genotype for each pair of parents in the three crosses?
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What is the function of the contractile vacuole in plant-like protists? A)maintenance of food levelsB) maintenance of energy levelsC) maintenance of waste levelsD) maintenance of water balance
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A bacterium was grown in two test tubes filled with media rich in glucose. One tube was sealed to produce anaerobic conditions, and the other was not. A third uninoculated, unsealed tube was used as a control. Glucose utilization by this bacterium causes acid production, which is indicated by a lightening of the media color. If the bacterium is able to produce ATP only by aerobic respiration, we expect lightening of media in ________.a. lightening of media in the sealed tube only b. lightening of media in the unsealed tube only c. lightening of media in the sealed and unsealed tubes only d. lightening of media in the control tube only
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From a throat culture, you have isolated gram-positive cocci that you cannot identify as staphylococci or streptococci. A test for one enzyme can be used to distinguish between these bacteria quickly. What is that enzyme?
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As Henry is exercising he pushes against a beam with a force of 25 Newtons.The beam does not move.Which statement is true.
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Survivorship Curves for Three Different Types of Organisms1000Number of survivors(log scale)50100Percentage of maximum life spanWhich survivorship strategy is used by the type III species?
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7. What is the room temperature in all3 temperature scales?
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In nature, animal populations are dynamic. This means they are changing due to various circumstances. The population of rabbits in certain areas of the world are affected by the population of foxes, for example. Using reasoning, which model shows the relationship between the two populations?
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ground water may have replaced the lime (material containing calcium) of shells and _____ with the mineral silica
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What is a reflex arc? what are the roles of the afferent and efferent nerves in this arc?
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Urey and Miller attempted to mimic conditions on early Earth to illustrate how the origin of life may have occurred billions of years ago. Which statement would provide the most evidence that early Earth's conditions were suitable for the formation of carbon-based life?A)Liquid from the sampling probe contained more than twenty different amino acids.B)The pH of the ocean waters was more acidic with less salinity than oceans today.C)The atmosphere contained heavy isotopes of hydrogen, like tritium, in the water molecules.D)The air sampled from the primitive atmosphere contained diatomic nitrogen rather than ammonia.
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Why does sound intensity decrease as the distance from the source increases?
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You want to make 50 ml of 1X tricaine solution in order to euthanize some fish. How much of a 20X tricaine stock solution will you need to dilute in order to make your solution?a. 1 ml b. 5 ml c. 0.4 ml d. 10 ml e. 2.5 ml
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