01 Intro part 2 - b Linnaean hierarchy from broad to...

Info icon This preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
Introduction to Biology part 2 VIII.Theme 2: Unity and Diversity A. Unity 1. All living things are composed of cells (part of cell theory) 2. All living things use the same hereditary material (DNA) 3. All living things have similar biochemistry a. Phosopholipid membranes b. Use ATP to transfer energy c. Use enzymes to facilitate reactions; enzymes remarkably similar across groups d. All proteins are constructed from the same 20 amino acids 4. Result: whole organisms have many similarities, and can be grouped hierarchically B. Diversity 1. Small differences within a species allow at least some individuals to reproduce as conditions change a. Natural selection alters the common characteristics of a species over generations 2. Larger differences between species determine their distribution 3. Species can be placed into groups based on their degree of similarity 4. Karl von Linne’ (Carolus Linnaeus in Latin) proposed a nested hierarchical structure of classification, ending in a binomial (literally, two names), in the 1730’s a. The binomial (genus and species) is unique within a kingdom
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: b. Linnaean hierarchy from broad to narrow: (1) Domain (added recently) (2) Kingdom (3) Phylum (Division in plants and fungi) (4) Class (5) Order (6) Family (7) Genus (8) Species 5. Three domains a. Bacteria – prokaryotic; the “common” bacteria b. Archaea – prokaryotic; often found in extreme environments c. Eukarya – eukaryotic; protists, fungi, animals and plants all belong here IX. Theme 3: Biological Systems A. The hierarchical nature of biological systems allows us to thoroughly examine small parts (i.e., cells, organelles) 1. If we understand the parts, what about the whole organism? 2. Emergent properties? 3. How do parts affect each other? B. Feedback Control 1. Negative feedback: abundance of a product suppresses its further production a. Very common in endocrine and nervous systems 2. Positive feedback: presence of a chemical product stimulates further production a. Uncommon in biological systems...
View Full Document

{[ snackBarMessage ]}

What students are saying

  • Left Quote Icon

    As a current student on this bumpy collegiate pathway, I stumbled upon Course Hero, where I can find study resources for nearly all my courses, get online help from tutors 24/7, and even share my old projects, papers, and lecture notes with other students.

    Student Picture

    Kiran Temple University Fox School of Business ‘17, Course Hero Intern

  • Left Quote Icon

    I cannot even describe how much Course Hero helped me this summer. It’s truly become something I can always rely on and help me. In the end, I was not only able to survive summer classes, but I was able to thrive thanks to Course Hero.

    Student Picture

    Dana University of Pennsylvania ‘17, Course Hero Intern

  • Left Quote Icon

    The ability to access any university’s resources through Course Hero proved invaluable in my case. I was behind on Tulane coursework and actually used UCLA’s materials to help me move forward and get everything together on time.

    Student Picture

    Jill Tulane University ‘16, Course Hero Intern