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Questions in biology

[Homework Help] Why do many different types of proteins exist even though there are a limited number of amino acids?

[Homework Help] How do human diseases caused by bacteria and those caused by viruses react to antibiotics?

[Homework Help] In pure water, a red blood cell from an animal will swell and burst, but a leaf cell from a plant will not. Which structure in the leaf cell is responsible for this difference?

[Homework Help] Sedimentation as a method of water purification results in what?

[Homework Help] What do all viruses need to reproduce?

[Homework Help] How could you use a microscope to help determine whether a specimen is a living or nonliving thing?

[Homework Help] A biologist hypothesizes that restricting food from mice will decrease their activity. He designs an experiment in which he observes the activity of 50 mice under restricted food regimens. Which of the following is true about his study?

[Homework Help] Describe the role of animals in the water and carbon cycles.

[Homework Help] Nucleic acids consist of nucleotides linked together with IONIC bonds. True or false? Explain.

[Homework Help] Enzymes are proteins that speed up reactions by _______________.