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Energy, Cell Respiration, Photosynthesis, Mitosis, Meiosis
Virginia Commonwealth University - BIOL101 - Loomis - Spring2010 - Test 2 - Chaps 6-10
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Biology
Undergraduate 1
03/02/2010

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Term
Mitochondria
Definition

Endosymbiotic organelle of bacterial origin that possess its own DNA.

 

(Further, Mitochondrial DNA is responsible for genetic adaptations in populations living in colder climates that allow them to create more body heat) CHAP6

Term
Photosynthesis
Definition
solar energy converted to chemical energy - sugars (high energy electrons). CHAP6
Term
First Law of Thermodynamics
Definition
Energy cannot be created or destroyed. Energy CAN be transformed, converted from one form to another. CHAP6
Term
Second Law of Thermodynamics
Definition

Energy transfer always results in a greater amount of entropy ("disorder") in the Universe.

 

With energy transformation, a portion of the energy is converted to heat. CHAP6

Term
Examples of increases in entropy
Definition
salt dissolves in H2O, a bicycle rolls downhill. CHAP6
Term
Glycogen
Definition
Sugars combine to form ...... CHAP6
Term
short-term energy storage is accomplished by...
Definition
ATP! CHAP6
Term
Long-term energy storage is accomplished by...
Definition
Glycogen and fat. CHAP6
Term
Enzyme
Definition

Many inherited disorders are caused by an inability to produce a specific...

 

These facilitate every chemical process.

 

The production of ... is encoded by units of DNA called genes. CHAP6

Term
Phenylketonuria, Tay-Sachs Disease.
Definition
examples of disorders caused by the inability to produce a specific enzyme or enzymes.
Term
Enzyme lactase
Definition
breaks down lactose and only lactose. CHAP6
Term
Lactose
Definition
composed of glucose and galactose. only the enzyme lactase can break down lactose in the body. CHAP6
Term
Metabolic pathway
Definition
A set of enzymatically controlled steps. Each enzyme performs a specific task. The product of one reaction becomes the substrate for the next. CHAP6
Term
Metabolism
Definition
The sum of all chemical reactions within a cell or larger organism. CHAP6
Term
Activation Energy
Definition
an amount of energy needed to start a reaction. CHAP6
Term
Activation Barriers and Enzymes.
Definition
enzymes bind to their substrates. Substrate molecules become more vulnerable to chemical alteration. Activation energy is lowered.
Term
Removing sugars from glycogen molecules
Definition
...releases energy, CHAP6
Term
The conversion of ADP to ATP
Definition
...requires energy. CHAP6
Term

Glucose + O2 -> CO2 + H2O + Energy

or

36 ADP + 36 P -> 36 ATP

Definition
Cellular Respiration. CHAP7
Term
The Brain
Definition
...needs a constant supply of glucose and O2 because it cannot store either. The brain can only go 4-6 minutes without oxygen after the heart has stopped. CHAP7
Term

ADP + P -> ATP requires energy

ATP -> ADP + P releases energy

Definition
the formation of ATP. CHAP7
Term
Energy from food is required to...
Definition
...to push a third phosphate bond in ATP. CHAP7
Term
Oxygen
Definition

is the final electron acceptor in the breakdown of glucose.

 

serves as a trashcan for energy poor electrons in the breakdown of glucose. CHAP7

Term
Oxidation reactions
Definition
the loss of electron(s) to another molecule CHAP7
Term
Reduction reactions
Definition
the gain of electron(s) from another molecule CHAP7
Term
an oxidizing agent...
Definition
...is reduced. And vice versa. Oxidation and Reduction always occur together. CHAP7
Term
NAD (Nicotinamide Adenine Dinucleotide>
Definition
The most important electron carrier in energy transfer. CHAP7
Term
Glycolysis
Definition

provides ATP for a burst of energy. The word means "sugar splitting."

 

First stage of cellular respiration. No oxygen is used. Occurs in the cytosol. CHAP7

Term
KREBS cycle
Definition

The main function is to transfer electrons to electron carriers like NAD-.

 

This process oxidizes pyruvates. It occurs in the mitochondrion. 2 pyruvates from glycolysis enter the mitochondrion from the cytosol by active transport. the pyruvates are transformed into acetyl coenzymeA.

 

first, the carboxyl group is removed and released as a molecule of CO2. pyruvate was a three carbon molecule, but now has one molecule of CO2. The two carbon molecule is oxidized to form acetate. Tbe lost electrons are transferred by an enzyme to NAD+, storing the energy as NADH. Finally, coenzymeA (a derivate of Vitamin B) is attached to acetate. It is an unstable bond which makes it very reactive which equals high energy. The acetyl group is fed into the KREBS cycle by being attached to oxaloacetate.CHAP7

Term
Electron Transport Chain (ETC)
Definition
Electron carriers drop off their electrons. 32 of the 36 ATP molecules made during all phases of cellular respiration come from the Electron Transport Chain.
Term
Glucose -> 2 pyruvate molecules
Definition

Glycolysis.

 

Pyruvate is slightly more oxidized than glucose. CHAP 7

Term
Phosphorylation
Definition
Adding phosphate groups to a molecule. CHAP7
Term
The breakdown of glucose
Definition
produces 4 ATP molecules. CHAP7
Term
The pyruvates
Definition
can go through all of cellular respiration - aerobic respiration, KREBS cycle, anaerobic respiration. CHAP7
Term
ATP synthase
Definition
performs chemiosmosis: uses the energy in the concentration gradient between the H+ found on either side of the mitochondrion membrane to make ATP. CHAP7
Term
Chemiosmosis
Definition
energy stored as H+ gradient across a membrane to drive cellular work. CHAP7
Term
the production of ATP
Definition
Hydrogen ions are pumped against their concentration and electrical gradients through an enzyme called ATP synthase. CHAP7
Term
Carbohydrates are made by
Definition
taking the electrons from water and supercharging them with the power from sunlight so that they can be binded to CO2. CHAP8
Term
Why are plants green?
Definition
Plants do not absorb the green wavelength of light. Photosynthesis is driven mainly by blue and red wavelengths. CHAP8
Term
Petiole
Definition
stem and blade. CHAP8
Term
Mesophyll cells
Definition
site of Photosynthesis. house chloroplasts. CHAP8
Term
stroma
Definition
liquid inside chloroplast, which is inside the mesophyll cells. CHAP8
Term
thylakoid
Definition
suspended network of membranes in stroma, in cholorplast, in mesophyll cell, in plant. CHAP8
Term
Thylakoid membrane.
Definition
all steps of photosynthesis occur within the... CHAP8
Term
granum
Definition
a stack of thylakoid. CHAP8
Term
critical events of the Light Reactions
Definition
H2O is split in photosystem II which gives us breathable oxygen. Solar energy is transformed into chemical energy: the boosting of an electron and then its transfer to a primary electron acceptor.
Term
The Calvin Cycle
Definition

light independent reaction and the second stage of photosynthesis.

 

joins CO2 to a low energy sugar to make a high energy sugar. the NADPH and the ATP made from the light reactions are formed in the stroma of the thylakoid.

 

takes place in the stroma.

 

IN: 3 CO2, 9 ATP, 6 NADPH

OUT: glucose

Term
4 sets of reactions in the Calvin Cycle
Definition
Carbon fixation, Energizing the sugar, Exit of product, Regeneration of RUBP
Term
RUBP
Definition
five carbon sugar that is regenerated in the Calvin Cycle
Term
The Light Reactions
Definition

IN: sunlight, 2 H2O

OUT: oxygen, NADPH, ATP

Term
genetics
Definition
the study of the physical inheritance of living things. CHAP9
Term
genome
Definition
library of genes
Term
genetic mutations
Definition
cause illness like cancer, sickle cell anemia, diabetes, heart disease, etc.
Term
four components of a gene
Definition

Cytosine C

Thymine T

Adenine A

Guanine G

 

CTAGATG could be one gene,

TAGCCGAT could be another.

Term
Cell Division
Definition

up to 25 million per second in a body. Your brain and central nervous system cells are formed in utero and usually do not divide. Your bone marrow cells, red blood cells, constantly divide. 180million red blood cells are made every minute.

 

The process takes one cell and makes two daughter cells. each daughter is an exact copy of the parent.

 

1.Replication

2.Mitosis

3.Cytokinesis

Term
DNA replication
Definition

1.Double helix unwinds and separates. the staircase splits down the middle.

2.Each single strand becomes a template pattern from which a new strand of DNA is created.

3. two new DNA strands are created, half of the strand is from the parent DNA and the other half is new.

Term
# Human chromosomes in a cell.
Definition
46, 23 from each parent.
Term
chromatin
Definition

protein with DNA wrapped around.

 

folds in on itself tightly to make a chromosome.

Term
chromatid
Definition
each strand of a duplicated chromosome.
Term
homologous chromosome
Definition

for every chromosome that we inherit from our mothers, we inherit chromosome with similar genes on it from our father.

 

for example, chromosome #10 has a copy from our mothers and one from our fathers. the same is true for every other chromosome in our cells.

 

so, all of our chromosomes are similar in size and function. that is what homologous means.

Term
the only exception to a homologous pair of chromosomes is...
Definition

the sex chromosomes.

 

(an AUTOSOME is any chromosome that is NOT a sex chromosome) we have 22 autosomes in our cells.

Term
the cell cycle
Definition

pattern of cell growth, genetic replication and division.

2 main phases: INTERPHASE where the cell prepares for division, and MITOTIC PHASE which includes mitosis and cytokinesis.

Term
Mitosis
Definition
the separation of the duplicated chromosomes
Term
Cytokinesis
Definition
the physical separation of the cell into 2 daughter cells.
Term
Meiosis
Definition

process by which eggs and sperm halve their chromosomal count to 23.

 

(mitosis copies and passes on 46 chromosomes)

 

the process of turning a diploid cell into a haploid cell.

Term
somatic cells
Definition
any cell that is not egg or sperm.
Term
gametes
Definition
egg and sperm
Term
Diploid & Haploid
Definition
Diploid: somatic cells have 2n chromosomes. N is the Haploid number (the number of chromosomes a gamete has). It is half the number of chromosomes found in a somatic cell. Humans: 23n, birds: n would be different.
Term
Crossing over
Definition
occurs in Prophase I when the chromosomes are condensing. They become entangled and exchange parts. Only the same parts of the chromosome can exchange.
Term
Independent Assortment
Definition

happens in Metaphase I when the homologous pairs line up at the metaphase plate. Chromosome from the mother can be on one side of the metaphase plate and a chromosome from the father can be on the other side.

 

ensures that all daughter cells do not end up with all chromosomes from the mother or father.

Term
Meiosis I
Definition

(same phases as mitosis) prophase, metaphase, anaphase, telophase, with differences.

 

ONE. Homologous chromosomes undergo crossing over in prophase I.

 

TWO. Homologous pairs line up at the metaphase plate during metaphase I. One chromosome from the mother and one chromosome from the father.

 

THREE. Homologous pairs undergo independent assortment at the metaphase plate during metaphase I.

Term
Anaphase I
Definition
Homologous chromosomes are pulled apart.
Term
Telophase I
Definition
at the end of cytokinesis, there are two daughter cells with homologous chromosomes.
Term
Meiosis II
Definition
Just like mitosis, but at the end of cytokinesis there are four daughter cells. The chrom. # has been halved. Daughter cells are now haploid. CHAP10
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