Biology Is Life !

What is the difference between an experiments dependent variable and its independent variable?
 

The independent variable is the thing that is being changed or altered in the experiment by the researcher.

The dependent variable is the effect of those changes which are being measured.



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what is the difference between sexual reproduction and asexual reproduction?
 

Asexual reproduction is when a single cell reproduces by mitosis and the offspring is identical.
examples: budding, binary fission

Sexual reproduction involves two parents that both produce one sex cell and the offspring's genetic information from each parent is equal.

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What is the difference between an autotroph and a heterotroph??
 

A autotroph creates its own energy from a inorganic source. Ex:plants
A heterotroph must rely on other food sources found within the environment.

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What is the difference between haploid and diploid cells?
 

The haploid number of chromosome is the number of sex chromosomes, in humans 23. It is represented by n. The diploid is the somatic or body number of chromosomes, in humans 46. It is represented by 2n.

Diploid vs. Haploid

What compounds do you need to make something organic and what makes something inorganic?
 

You need carbon in a compound to make it organic. Methane is organic since it has 4 hydrogen atoms and a carbon atom. Inorganic compounds do not have carbon in them. Water is a inorganic compound since it has only one hydrogen atom and 2 oxygen atoms.

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How do worms move?
 

They have two kinds of muscles: circular and longitudinal. When they tighten their circular muscles they become long and thin, and their front end moves forward. Then they contract their longitudinal muscles to move their back end toward their front end. They also use thier setae which are short bristly hairs that also help them move.

YHow Worms Move

What affects the activities of enzymes??
 

The activities of enzymes are affected by their structure. As well as other factors like temperature, concentration of the substrate and the chemical environment.

What is a niche?
 

sorry I forgot the link

Enzymes
 

A niche is the function or position of an organism in an ecosystem. Basically, it's were an organism fits into it's habitat and what role it plays.

Next Question:
The Arctic Circle is on the top of the world. There are many species of marine and land life. What word could be used to describe the Aarctic Circle as a whole?
 

the arctic circle is located in the tundra...it is the coldest place in the world...during the summer months of may through July the sun shine 24 hours a day. Even during the summer months the maximum temperature has only been 55 degrees Fahrenheit.

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What is homeostasis?
 

homeostasis is the property of either an open system or a closed system, especially a living organism, that regulates its internal environment so as to maintain a stable, constant condition.

Ex.temperature, salinity, acidity, and the concentrations of nutrients and wastes

http://www.easternct.edu/personal/faculty/saull/sect9/resous9/cartos9/homeos9.html

What are the differences between Darwin and Lamarck?
 

Lamarck believed that change occurred quickly, and his theory is wrong. Darwin has his theory of natural selection, and that mutations cause gradual change, etc.
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What are the stages of mitosis? Give a brief description.
 

The phases of mitosis are prophase anaphase metaphase and telophase. Mitosis is the spliting or replication of a cell.
http://www.accessexcellence.org/RC/VL/GG/mitosis.php




What makes up a zygote?
 

A zygote is a fertilized egg cell. It consists of two haploid gametes, usually being an ovum and a sperm cell. The zygote is a diploid cell.

Zygote

How does a species become resistant to certain chemicals?
 

A species becomes imune or resistant to chemichals because when a chemical that is harmfull is introduced there is naturaly occuring resistant organisms. Those resistant survive and reproduce.

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What is the heterotroph hypothosies? ( sory i cant spell )
 

mr w states "species becomes immune or resistant"... a correction.... immune is a body defense process done by white blood cells. it is a common MISUSE of the term to apply it to the genetic term resistance. resistance IS a random genetic (in our genes) thing.... they are different concepts and NYS likes to try to trick you. pick you word carefully.
:)
hj
 

The heterotroph hypothesis states that the first living forms on the earth were heterotrophs; life forms that can not produce their own food. It also states that the organisms are anaerobic, meaning that they do not make oxygen. It also states that life formed from organic molecules. This is better known as the "Oparin Theory."



What did Lamarck's theory state?
 

Lamark's (loser!!) theory states that if an organism uses one of its characterics then it will become bigger and stronger over renerations but it also states that if an organism does not use a certain characteristic then it will become smaller or weaker.

The Loser's theory


What is the nitrogen cycle??
 

the nitrogen cycle is the movement of nitrogen through the atmoshere, soil and organisms. Nitrogen-fixing bacteria forms nitrates from atmosphere nitrogen. Nitrates are used by plants to form proteins that are fed through the food chain. organisms excrete wastes releasing nitrogen. bacteria of decay break down dead organisms' nitrogen into ammonia. nitrifying bacteria turns ammonia into nitrates. denitrifing bacteria turns ammonia into nitrogen. Cycle is continuously repeated.

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what is the job of the white blood cell?
 

White Blood Cells are leukocytes, are cells of the immune system that defend against the infectious disease and foreign materials. Several different types of leukocytes exist, but they all are produced inbone marrow. White blood cells are found throughout your body, within your blood and lymphatic system.

WBC

What are monocots and dicots? And what ware their differences?
 

Monocots and dicots are seeds. A dicot is a seed that has two cotyledons. A monocot is a seed that has one cotyleden. The cotyledon is the outside of the seed. A monocot has parallel-veined leaves and a dicot has net-veined leaves. The vascular bundles in a monocot are scattered and the ones in a dicot are formed in a circular ring. the root systems are different too.

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What is selective breeding?
 

Selective breeding is the selection of certain seeds or animals for reproduction in order to influence the traits inherited by the next generation. Usually the strongest and best are used to breed.

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What does the mitochondria do?
 

The mitochondria is the power house of the cell it basically prodcuces ATP and regulates cellular metabolism.

mitochondria

What is the job of a vacuole?
 

The vacuole is a cavity in the cell that is surrounded by a single membrane that can contain food, fluids, and metabloic wastes. It is found in the cells of protists, plants, and primitive animals.

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What is natural selection?
 

natral selection is the process by which favorable heritable traits become more common in successive generations of a population of reproducing organisms, and unfavorable heritable traits become less common. it acts on the phenotype.
natural selection


how we cause species to become extinct?
 

Humans are said to be the main cause of animal extinction - they have already been the cause of endangered species. For example, deforestation can cause habitat loss and food shortage for certain organisms. Also, pollution (air, for example) can cause species to die and maybe mutate? Even population growth can contribute to this.
werdddd.
 

Whoops. How does a food energy pyramid work?
 

A food pyramid works by its a diagram showing the biomass at each trophic level of a food chain.

http://qldscienceteachers.tripod.com/junior/biology/foodchains.html

What kinds of cells do mitosis and meiosis?
 

good morning
on this hot humid saturday
w/ 6 class days to go
:)
hj
 

Eukaryotes do mitosis. In mitosis, each daughter cell gets about half of the cytoplasm from the mother cell and one set or copy of the DNA.

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what affects the activity of enzymes?
 

temperature and pH effect the activity of enzymes.


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What is the definition of evolution?
 

the deffinition of evolution is the biology theory of development from earlier forms: the theoretical process by which all species develop from earlier forms of life. According to this theory, natural variation in the genetic material of a population favors reproduction by some individuals more than others, so that over the generations all members of the population come to possess the favorable traits.

http://encarta.msn.com/dictionary_1861609553/evolution.html

what are nuerons?