{[ promptMessage ]}

Bookmark it

{[ promptMessage ]}

Lecture 18 - 3.Plants multicellular autotrophs(descent from...

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

View Full Document Right Arrow Icon
BIOLOGY 1001: LECTURE 18 EVOLUTION OF EUKARYOTES DNA HYBRIDIZATION: comparison of whole genomes of two species by estimating degree of bonding between single-stranded DNA obtained from each species MOLECULAR CLOCK: estimate of time since two species shared a common ancestor based on degree of genetic difference, assuming that rate of change has been constant The prokaryotes belong to two kingdoms: A.ARCHAEBACTERIA - restricted to extreme environments similar to early earth B.EUBACTERIA - all other bacteria, spirochaetes, cyanobacteria, etc. Origins of the endosymbiotic organelles: Mitochondria were free-living aerobic, heterotrophic eubacteria Chloroplasts were free-living autotrophic cyanobacteria The eukaryotes comprise four kingdoms: 1.Protista - eight major taxonomic groups including: a.Protozoa - unicellular heterotrophs b.Eukaryotic algae - unicellular autotrophs c.Slime molds - single/multi-cellular heterotrophs 2.Fungi - multicellular heterotrophs (descent from red algae or slime molds)
Image of page 1
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: 3.Plants - multicellular autotrophs (descent from green algae) 4.Animals - multicellular heterotrophs (descent from protozoa) AUTOTROPHIC NUTRITION - organism produces its own organic nutrients from sunlight or other inorganic sources EUKARYOTES - Organisms with cells containing a nucleus and organelles HETEROTROPHIC NUTRITION - organism acquires organic nutrients by eating the products of other organisms ORGANELLES - Unit within the cytoplasm of the cell that performs a specialized function A.MITOCHONDRIA - site of cellular respiration B.CHLOROPLAST - site of photosynthesis (conversion of CO 2 and H 2 O to organic compounds by sunlight) PROKARYOTES - Organisms with cells lacking a nucleus SYMBIOSIS - Where two different organisms live in direct contact 1.MUTUALISM: both species benefit 2.COMMENSALISM: one species benefits, the other is unaffected 3.PARASITISM: one species benefits at the other's expense...
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