Viruses: Complex Molecules or Simple Life Forms? Viruses have been defined as "entities whose genomes are elements of nucleic acid that replicate inside living cells using the cellular synthetic machinery‚ and cause the synthesis of specialised elements that can transfer the genome to other cells." They are stationaryand are unable to grow. Because of all these factors‚ it is debatable whether viruses are the most complex of molecules or the simplest life forms. While the definition
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____ 1. The work of scientists usually begins with a. testing a hypothesis. b. careful observations. c. d. creating experiments. drawing conclusions. ____ 2. What is the term for all parts of Earth inhabited by living things? a. population b. ecosystem c. biosphere d. environment 3. Which of the following are likely topics in a biology course? a. Why does the Texas horned lizard squirt blood out of its eyes? b. How is a banded pipefish able to hide in its environment of seaweeds? c. What
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Physical Properties of Organic Molecules Abstract Identifying the physical properties of compounds can be useful in several ways. It helps us to determine the structure of certain compounds‚ the purity of substances and if a substance is not pure we can figure out how to separate contaminating substances from a compound. In this experiment‚ I learned how to determine a solid’s melting point and why some melting point ranges may be broader than others.
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Name Class Date RNA and Protein Synthesis Information and Heredity Q: How does information flow from DNA to RNA to direct the synthesis of proteins? WHAT I KNOW 13.1 What is RNA? 13.2 How do cells make proteins? 13.3 What happens when a cell’s DNA changes? 13.4 How do cells regulate gene expression? WHAT I LEARNED SAMPLE ANSWER: RNA is a nucleic acid that carries coded genetic information. SAMPLE ANSWER: SAMPLE ANSWER: The bases in DNA—A‚ T‚ G‚ and C—form a four-letter “alphabet” that
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Identifying Biological Molecules with Colorimetric Chemical Tests Objectives Perform a series of accurate tests on biological molecules to detect the presence of carbohydrates and proteins‚ as well as the action of an enzyme on specific molecules. Introduction Unknown biological molecules can be correctly identified using various tests‚ including colorimetric chemical tests. Colorimetric tests are when a chemical reagent‚ such as Benedict’s‚ is used on a substance or solution and a certain
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Exam 1 Study Guide: Multiple Choice and Matching Chapter 1. a. Two question that each give an example of one of the characteristics of living things listed below. 1. Require Energy and Raw Materials 2. Are Composed of Cells 3. Maintain Homeostasis 4. Respond to Their Environment 5. Grow and Reproduce 6. Are Capable of Evolving b. What are the characteristics that are unique to humans? c. Know the meaning of all the terms listed below. Scientific Method‚ scientific theory‚ hypotheses‚ data
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Aim A. To investigate the existence of hydrogen bonds between ethanol molecules. B. To measure the strength of hydrogen bond formed between ethanol molecules C. To investigate the formation of hydrogen bonds between molecules of ethyl ethanoate and trichloromethane. D. To measure the strength of hydrogen bond formed between molecules of ethyl ethanoate and trichloromethane. Procedure A. 1. 10 cm3 of ethanol was added into an insulated 50 cm3 beaker by using a measuring
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Lab Report #6 Electrophoresis: Using Electricity to Separate Molecules Answer the following questions about the results of the virtual lab activity. Record your answers in the boxes. Activity 1 – Calibration Record your data from Activity 1 in the boxes below. Enter the data (number of bands‚ description of the band patterns) you collected for the protein ladder in the appropriate columns for the gel concentrations (8%‚ 10%‚ 12%) Gel 8% 10% 12% Number of Bands 4 5 6 Description of Band
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Lab 2 Prokaryotes Purpose: Performing this lab will help me better understand the characteristics of prokaryotes and compare them with eukaryotes. This lab will also help me visualize and better understand the physical description‚ and the different types of bacteria and how they stain‚ whether it be gram positive or gram negative. Hypothesis: If I read the textbook and use the resource websites‚ then I will be able to better understand prokaryotes and describe the structural characteristics of viruses
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The nucleus is mostly round‚ however it may be oval or disc shaped‚ depending on the type of cell. Nucleus‚ also known as “the brain” of the cell‚ contains most of the genetic material of the cell‚ called DNA‚ and is responsible for controlling the cells function. The nucleus is the largest organelle. It occupies 10% of the total volume of the cell. The large structure of the nucleus‚ allows it to maintain more information and genetic material. The nucleus is surrounded by a nuclear
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