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Bio II Lab - Quiz #2 Terms
Bacteria, Protista, Photosynthesis
33
Biology
Undergraduate 1
01/17/2014

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Term
Saprophytes
Definition
A type of bacteria that decomposes dying material.
Term
Symbiotic
Definition
Mutualistic associations with other organisms in which both partners benefit from the relationship.
Term
Coccus
Definition
One of the three main types of bacterial shapes (spherical)
Term
Bacillus
Definition
One of the three main types of bacterial shapes (rod-shaped)
Term
Spirillum
Definition
One of the three main types of bacterial shapes (helical)
Term
Gram-positive bacteria
Definition
Bacteria with simple cell walls with a very thick peptidoglycan layer that is capable of retaining the Crystal violet dye (purple) used during the gram staining procedure.
Term
Gram-negative bacteria
Definition
Bacteria with a thinner layer of peptidoglycan in their cell walls. These bacteria stain dark pink from the Safranin dye. Their cell walls are more complex due to the presence of lipopolysaccharides which secrete potent toxins.
Term
Autotrophy
Definition
A biochemical feature of some bacteria characterized by the ability to use light to generate their own carbon sources.
Term
Hetrotrophy
Definition
A biochemical feature of some bacteria characterized by the requirement of organic molecules to obtain carbon.
Term
Chlamydomonas
Definition
One of the five genera of the algae phylum Chlorophyta (Volvocine line). Single celled motile alga with a stigma (eyespot) that functions in the absorption of light. Reproduction is usually asexual except during times of environmental stress where the organism undergoes isogamy.
Term
Volvox
Definition
One of the five genera of the algae phylum Chlorophyta (Volvocine line). It is colonial, has specialized cells for reproduction and is oogamous which is unique within the five genera.
Term
Isogamy
Definition
When an organism produces identically sized and shaped gametes for sexual reproduction.
Term
Oogamous
Definition
Where an organism produces gametes that are not identical; one gamete is small and motile while the other is large and non-motile.
Term
Myxomycota
Definition
Protist known as slime molds; are brightly colored (yellow or orange), heterotrophic, and exhibit amoeboid movement. They are decomposers. Their cell walls are made of cellulose.
Term
Bile Salts
Definition
Ingredient in the MacConkey agar plate the inhibits the growth of gram-positive bacteria.
Term
B-hemolysis
Definition
The complete breakdown (lysis) of red blood cells around bacterial colonies.
Term
Stigma
Definition
Eye spot in algae that functions in the absorption of light.
Term
Algae
Definition
An aquatic group of autotrophic organisms that commonly occupy marine and freshwater environments; classified into 5 phyla.
Term
Protozoa
Definition
Unicellular heterotrophic organisms that occupy marine, freshwater, and terrestrial environments. They are classified by their mode of locomotion.
Term
Amoeba
Definition
Protozoa that moves through the use of pseudopods.
Term
Paramecium
Definition
Protozoa that moves through the use of cilia.
Term
Trypanosoma
Definition
Protozoa that moves through the use of flagella.
Term
Chloroplasts
Definition
Specialized organelles in plants that house the green pigment chlorophyll and is the place where photosynthesis occurs.
Term
Light-dependent (photochemical/light) reactions
Definition
One of the three stages of photosynthesis. It is powered by sunlight and occurs in the thylakoids. It takes in H20, ADP, P, and NADP and releases O2, ATP, and NADPH.
Term
Light-independent (biochemical/dark reactions)
Definition
One of the three stages of photosynthesis. Plants use the products (ATP and NADH) of the light-dependent reactions to build carbohydrates. It occurs in the stroma, takes in CO2 and releases Glucose. Also known as the Calvin cycle.
Term
Light capturing events
Definition
One of the three stages of photosynthesis; chlorophyll in the thylakoid membranes absorbs photons of light resulting in excitation of the electrons present.
Term
Pigments
Definition
Substances that absorb light in the visible spectrum and transfer the light energy to electrons. Two types: primary and accessory.
Term
Chlorophyll a
Definition
Primary pigment in plants and cyanobacteria because it's the only pigment that can convert light energy to chemical energy directly.
Term
Accessory pigments
Definition
Act as magnifiers that capture and transfer light energy to chlorophyll a. Includes chlorophyll b, carotenes, and xanthophylls.
Term
Carotenoids
Definition
Have two roles, protection and light absorption. They eliminate free radicals that are produced from oxidation-reduction reactions in the chloroplast as well as help to capture energy from light that is composed of wavelengths that aren't efficiently absorbed by both chlorophull a and b. Include carotenes and xanthophylls.
Term
Chlorophylls
Definition
Absorb light at wavelengths in the ranges of 425-450nm (blue) and 625-675nm (orange-red)
Term
Carotenoids
Definition
Have a much broader absorption peak, ranging from 400-525nm (blue-green).
Term
Fluorescence
Definition
Remaining energy released by plants that is dissipated in the form of light with a larger, less energetic wavelength. Occurs when energized electrons are unable to be passed onto the next pigment molecule in either photosystem and fall back into their original lower energy orbital.
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