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Questions in biology

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

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

[Answered] 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?

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

[Answered] What do all viruses need to reproduce?

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

[Answered] 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?

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

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

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