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KEY CONCEPT Technology continually changes the way biologists work.

Discover how technology continually transforms biology. Learn about observations, molecular genetics, models, and imaging tools like microscopes & electron microscopes. See the impact of imaging technology in medicine and modeling complex biological systems. Dive into molecular genetics tools, DNA studies, genomics, and computer simulations in biological research. Test your knowledge with a Quick Quiz!

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KEY CONCEPT Technology continually changes the way biologists work.

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  1. KEY CONCEPTTechnology continually changes the way biologists work.

  2. Objectives for section 1-4 (page 22) • Give examples of types of observations. • State contributions to science through technology. • Explain the importance of models and computers. • Elaborate on how molecular genetics produces new biological studies.

  3. Imaging technologies provide new views of life. • Microscopes provide an enlarged image of an object. • light microscopes (LM) – use beam of light to magnify • Living or dead materials • View in color • WHS Range 40x – 400x stoma

  4. stoma Imaging technologies provide new views of life • Two types of electron microscopes – uses beams of electrons to magnify objects up to 1 million times! • Scanning electron microscopes (SEM) -Only dead specimens used -Covered in metal -Scans the surface for a 3-D view

  5. stoma Imaging technologies provide new views of life. • Both electron microscopes produce images in black and white and then are artificially colored • Transmission electron microscopes (TEM) -Transmits electrons through specimen - Two-dimensional image -Only dead specimens

  6. Imaging technology is used in medicine. • X-ray images -magnetic resonance imaging (MRI)

  7. Imaging technology is used in medicine. • functional MRI (fMRI)

  8. Complex systems are modeled on computers. Normal heartbeat • Computer models are used to study systems that cannot be studied directly. • heart attacks • effect of medicines on the human body Heart attack • movement of water molecules into and out of a cell • spread of a disease through a population

  9. Complex systems are modeled on computers. • Computer models are used when experiments are not safe, ethical, or practical. • Cube lab

  10. The tools of molecular genetics give rise to new biological studies. • A gene is a segment of DNA that stores genetic information.

  11. Through our understanding of DNA, we can study genetics on a molecular level. • molecular genetics is study and manipulation of DNA on a molecular level used to study evolution, ecology, etc. • Genomics is study and comparison of genomes of and within a species

  12. Quick Quiz Time  • Each question will be worth 2 points • You may NOT talk and/or communicate with a classmate • Scores will be collected and recorded at the end of the chapter

  13. 15. An electron microscope would be the best choice for viewing A. live bacteria. B. human ligaments. C. details of cell structure. D. a person’s brain activity.

  14. 16. Complex studies, such as those that investigate disease transmission in humans, often use which of the following methods? • Multiple lab experiments • Computer modeling • Magnetic resonance imaging (MRI) • Human testing

  15. 17. Which phrase best defines a gene? • Basic unit of life • Segment of DNA • Slice of a specimen • Inherited trait

  16. Trade your paper with a non-lab partner

  17. 15. An electron microscope would be the best choice for viewing A. live bacteria. B. human ligaments. C. details of cell structure. D. a person’s brain activity.

  18. 16. Complex studies, such as those that investigate disease transmission in humans, often use which of the following methods? • Multiple lab experiments • Computer modeling • Magnetic resonance imaging (MRI) • Human testing

  19. 17. Which phrase best defines a gene? • Basic unit of life • Segment of DNA • Slice of a specimen • Inherited trait

  20. End of show

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