Biology

ANSWER THIS FOR 20 POINTS!!!
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1. You have set up a cell-free transcription system in a test tube. By mixing DNA, RNA polymerase, sigma factors, ribonucleotides and other essential substances you are able to make mRNAs identical to those made under a variety of conditions in the cells from which these components were isolated. What would happen if you were able to remove the sigma factor first added to the tube and replace it with another sigma factor
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The HPA axis of the endocrine system works together with the sympathetic nervous system to increase an individual's heart rate, blood flow, and blood sugar levels during times of stress. This stress response is also referred to as the
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An energy pyramid is shown below. What does the energy pyramid demonstrate? A. The same amount of energy is available at every level of the energy pyramid. B. Energy is not transferred between organisms in an ecosystem. C. A great amount of energy is gained moving up the energy pyramid. D. A great amount of energy is lost traveling up the energy pyramid.
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What is one of the biomolecules for which nitrogen is needed (hint: they help build muscles)?
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Which of the following is NOT an example of a primary consumer?A. Maple treesB. CaterpillarsC. CowsD. Horses
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What is the function of the large intestine?A. Add bile to the food to help break it down.B. Remove nutrients from the food with chemical processesC. Absorb remaining material into the bodyD. Remove water from the remaining undigested material
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Which statement about how geologists study the ages of rock layers is true?The law of superposition means that older rocks are on top.Geologists can find the exact age of a rock by looking at its relative position.The principle of original horizontality provides the basis for the law of superposition.Relative age can be determined by using the concept of unconformity.
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When the person from number one was creating "true breeding" lines of plants for certain traits, what method was used?
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Help please!!! The answer doesnt need to be long.
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Explain how prokaryotes (note that this is for prokaryotes and NOT eukaryotes) control gene expression.
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Please help!!!!!!!!!!!!!!!
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WILL GIVE BRAINISTQuestion 1 OnlyYears after the lava from an erupting volcano destroyed an area, lichens started to grow in that area. These were gradually replaced by grasses, shrubs, conifers, and finally by a deciduous forest. In this sequence of events, the lichens functioned as What?(Answer if you know.)A. primary consumersB. abiotic factorsC. pioneer organismsD. climax organisms
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Lakesha was culturing bacteria. She used aseptic technique to make sure there was no contamination. When she was finished, she used water to clean the surface of her table. She then put the sample in the incubator, removed her gloves, and washed her hands with soap and water.
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plssssss Help No Links
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An ion of aluminum has a charge of 3+. The ion contains 10 electrons. How many protons does a neutral atom of aluminum possess?
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Write a paragraph about how one would go about eradicating malaria in West Africa.
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Which of the following is an organic molecule?
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If mRNA had the codon GUA, what amino acid does that code for?
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A "healthy ecosystem" can also be described as
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An increase in heart rate (your heart pumps faster) results in...
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Genetic drift is a process that causesA. organisms to have the same DNA as their parents B. the genetic makeup of an entire population to changeC. the genetic makeup of an entire population disappear. D. organisms to better adapt to their environment.
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A train travels 800 kilometers in 6 hours. What is the average speed of the train?
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A research essay should always include a(n) ____ to protect the writer from accusations of ____A. date; latenessB. works-cited list; faulty reasoningC. introduction; having constructed a poor argumentD. works-cited list; plagiarism
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