Biology

Biology is a branch of science that studies the nature of life from the smallest parts of living things to the largest plants and animals. Ask and answer questions about the living world and its wonderful inhabitants in this category!

Asked in Miscellaneous, Biology, Genetics

How is a test cross set up?

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Organism to be tested is crossed with a homozygous recessive . If all progeny is similar to tested organism , it is homozygous and if 50% progeny is similar to tested organism , it is heterozygous .Classic Mendelian example is cross of a tall plant to check its genetic make up by crossing with homozygous recessive dwarf plant .
Asked in Science, Biology, Chemistry

What is hydrophobic exclusion?

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When non- polar molecules "shrink" from contact with water; they are considered hydrophobic. Hydrophobic means "water fearing", while polar molecules are hydrophilic, meaning "water loving".
Asked in Biology, Ecosystems

Do plants remove oxygen from the air indoors?

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Well, yes and no. Plants take in CO2 and release oxygen during the day, however during the night it does the opposite, it takes in oxygen and releases CO2. This is why it is good to have plants in your house during the day but not in the night. Make sure you take it out of your rook so that you can have a better nights sleep.
Asked in Biology, Genetics

Is a carrier homozygous or heterozygous?

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A carrier would have to by heterozygous. Carriers don't express the "carried" allele but have it nevertheless. This means it has to have one allele of each. For example, if a trait has alleles A (dominant) and a (recessive), the heterozygous genotype will be Aa and will display the dominant phenotype (unless the trait is a special/more complex type of expression like incomplete dominance).
Asked in Biology, Protists, Bacteria, Microscopes

How does staphylococcus move?

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There are different types of staph infections the cause many illnesses. A mild case of the bacterial infection is passed along by personal contact causing skin infections. a more serious, but rare case, is when the bacteria enters the body through a break in the skin. It moves to the bloodstream infecting organs, joints or the nervous system. Answer 2 Staphylococcus don't move as they lack flagella , they drift .
Asked in Biology, Example Sentences

How would you use the word epistaxis in a sentence?

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He had an epistaxis after the fight, he had to be taken to the hospital.
Asked in Biology, Biochemistry

What are PGAL and RuBP?

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PGAL is more commonly know as G3P, or glyceraldehyde-3-phosphate. It is the final product of the Calvin Cycle, or the dark reaction in plants. Two G3P molecules, which are each 3-carbon compounds, go on to create glucose. RuBP is ribulose bis phosphate . It is an organic compound used in Calvin cycle, it is used to fix CO2 during Calvin cycle . where one CO2 molecule is covalently bonded to RuBP to form an unstable intermediary compound that later breaks down by an enzymatic reactions to form G3P. It is vital for carbon fixation in plants.
Asked in Biology, Chemistry, History of Science

What is biological methods?

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The scientific method in which biological problems are solved is termed as biological method.It comprises the steps a biologist adopt in order to solve a biological problem,In solving a biological problem a biologist adopt the following steps 1) Recognition of biological problem. 2) Observation. 3) Hypothesis formulation. 4) Deduction. 5) Experimentation. 6) Summarization of result. 7) Reporting of result. 8) Formation of theory. 9) Biological Law
Asked in Biology, Chemistry

What are molecules that do not readily dissolve in water?

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A general rule when determining the solubility of one substance into another is to look at their polarity. If both substances are polar they tend to be soluble with each-other. Water is a polar substance (Oxygen has a higher electronegativity than Hydrogen, therefore it draws the electrons away from the Hydrogen, this combined with the 120 degree H-O-H structure of the molecule causes polarity with the oxygen being slightly negative while the hydrogen atoms are slightly positive). Answer 2 Metals , hydrocarbons , Petroleum , plastics , etc being non polar are insoluble in water .
Asked in Biology, Human Anatomy and Physiology

What is the structural organization of the human body?

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The structural organisation of the human body is very easy i.e. the general and basic structure CELLS form TISSUES form ORGANS form ORGAN SYSTEMS form HUMAN BODY Examples: CELL is any cell in the human body in any of the systems. For eg. Nerve cell(Neuron), Muscel cell etc. TISSUE- Many similar type of cells combine to form a tissue. For eg. A muscel in the human body, a nerve of the nervous system etc. ORGAN- Multiple tissues combine to form an organ. For eg. The heart, the stomach etc. ORGAN SYSTEMS- Many organs combine to form the organ system. For eg. The digestive system, the nervous system etc. HUMAN BODY- All the organ systems of the human body combine to form the body and help it function.
Asked in Biology, Genetics, Biochemistry

Why is a buffer needed in gel electrophoresis?

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The buffer is the medium through which the current flows. In the electrophoresis chamber, the anode and cathode are separated and the gel is placed between them. In order to close the circuit and generate the voltage which causes the migration, the entire chamber is filled with a conductive buffer. It is actually possible to perform electrophoresis without a buffer; however this requires a specially made electrophoresis chamber. In these chambers the electrodes actually contact the top and bottom of the gel eliminating the need for a conductive buffer to close the circuit. SDS PAGE electrophoresis uses buffer not primarily as a conductor but for holding a desired pH, dissipating heat and providing SDS in excess in the case of denaturing gels. A gel would run without a buffer as the gel itself is a conductor but the currents involved would heat it to the point of decomposition. Also the volume of liquid in a gel does not allow for an adequate pH buffering system. Holding a pH is extremely important for reproducibility especially in native gels as the pH can change the charge on the peptide. It is true some gels do not require buffer but these are rare cases like isoelectric focusing. the primary application of the buffer would be to conduct electricity,to form a closed circuit
Asked in Biology, Zoology or Animal Biology, Botany or Plant Biology

What is the largest living organism by mass?

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The largest living organism, by mass and also by length, is found among the Giant Sequoia Red Wood trees of California's Sierra Nevada Mountains, U.S.A. Several "groves" of these trees can be found along the western slope of the Sierra's within California. The largest diameter tree ever found was 35 ft. in diameter (not circumference, 'diameter,' measuring across the width of the trunk). These trees exceed 350 ft tall. Some have been found to exceed 3000 years old. The Coast Redwoods of California's coastal mountain range would be the source for the second largest living organism type. Some say that the largest organism is a specific fungus growing in Oregon, but it cannot be proven that this is, or is not a "colony" of may fungi, rather than a single organism. Some say the Great Barrier Reef is the largest organism but, once again, this is a very large cluster of many organisms, not a single organism. The Male African elephants are the largest living animals on land, while blue whales are the largest animals in the sea.
Asked in Biology, Microbiology, Biochemistry

Do cellular respiration and fermentation have any similar reactions?

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Both start with glycolysis... but once you reach pyruvic acid, they're very different. Respiration final product is an inorganic compound (oxygen) whereas fermentation final product is an organic compound (such as lactic acid or ethanol)
Asked in Biology, Botany or Plant Biology

Does the leaves of a moss plant have vascular tissue?

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No.. This is because mosses are non vascular, meaning they don't contain vascular tissues. The conduction of water and minerals takes place with the help of special cells known as conducting cells.
Asked in Biology, Meteorology and Weather, Botany or Plant Biology

How does low humidity affect transpiration?

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Low humidity makes the transpiration very active because the water molecules move from the region of higher concentration (plant) towards the region of lower concentration (dry or less humid atmosphere).
Asked in Biology, Camels, Exotic Farm Animals

Why the RBC of camel is nucleatated?

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RBC of all the mammals is anucleated without any exception. RBC of mammals are nucleated only during embryonic stages. It's just that RBC's of camels and llama are oval in shape and anucleated.
Asked in Biology, Botany or Plant Biology

Do variegated leaves contain chlorophyll?

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Yes, the green parts of the leaf will have chlorophyll and can carry out photosynthesis.
Asked in Biology

Difference between colonial organisms and filamentous organisms?

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The main difference is that filamentous organisms are thread-like in structure, such as fungi and algae. Colonial organisms are those that live in colonies to survive.
Asked in Science, Biology, Botany or Plant Biology, Evaporation and Condensation

Is transpiration faster than evaporation?

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My first guess would be that they evaporate at the same speed, trick question. My second guess would be that the leaves are higher, and there's much less water on the plant, so it would evaporate faster; that's not taking into account shaded areas. To me, transpiration -is- evaporation, so it's the same speed. But don't take my word for it. My first guess would be that they evaporate at the same speed, trick question. My second guess would be that the leaves are higher, and there's much less water on the plant, so it would evaporate faster; that's not taking into account shaded areas. To me, transpiration -is- evaporation, so it's the same speed. But don't take my word for it. TRANSPIRATION is The act or process of transpiring, especially through the stomata of plant surface . while EVAPORATION is Conversion of a liquid to the vapor state . Evaporation is faster as compared to evaporation . Many factors are involved in it. Most transpiration takes place during day while evaporation day and night .
Asked in Biology, Muscular System

What is the difference between voluntary and involuntary movement?

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Voluntary motions are completely under the control of an organism like walking, jumping etc but Involuntary motions are completed without any conscious recognition and effort of organism like heart beat and reflex actions. Not quite the same as conscious versus unconscious.
Asked in Biology, Human Anatomy and Physiology

Where are mast cells found in the body?

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Mast cells are found primarily in the skin and digestive system, including the liver and spleen, and produce histamine, a chemical most famous for its ability to cause itching.
Asked in Biology, Chemistry, Organic Chemistry

What is the defining characteristic of organic molecules?

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Organic chemistry is defined as 'the chemistry of compounds of Carbon'. Or, more accurately, compounds containing carbon-hydrogen bonds. (For example, carbon dioxide doesn't count as organic.)
Asked in Biology, Biochemistry

Does insulin convert glycogen to glucose?

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No. Insulin converts glucose into glycogen for storage in the body. Glucagon converts glycogen into glucose. (it's the various cells in the body that do the conversion in either case, insulin and glucagon are hormones that induce the shift in the metabolism.)