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3 years ago

What is heat? - - - please answer

Biology

2 answers:

olga2289 [7]3 years ago

3 0

Heat flows from hot objects to cool objects

liubo4ka [24]3 years ago

3 0

Heat is the transfer of kinetic energy from one medium or object to another, or from an energy source to a medium or object. ... This is the amount of heat required to raise the temperature of one pound of pure liquid water by one degree Fahrenheit.

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Pls help thanks explain your answer.

vfiekz [6]

Answer:

Explanation:

There must be a lot of producers due to the fact that only 10% of energy passes onto the next level. The producers need to keep up with the energy supply so there are many of them.

3 0

3 years ago

Which term describes an educated guess of the answer to a problem?

kondor19780726 [428]

Answer:

Hypothesis is a educated guess

Explanation:

8 0

3 years ago

Graded Assignment

kirza4 [7]

Answer:

the tests and indicators used for detection of starch, Albumin, Vegetable oil and milk are explained below

Explanation:

Iodine indicator

For presence of starch in biological molecules, iodine test is used. Few drops of iodine solution are added to the sample (containing starch carbohydrate). If the color turns blue-black, it will indicate the presence of starch in the solution and vice versa.

Iodine test is commonly used for identification starch.

Sodium hydroxide/Copper sulfate test for detection of Albumin

This test is called as Biuret performed for the detection of proteins (Albumin in this case). In this experiment, Biuret reagent is used which is combination of copper sulfate and sodium hydroxide. Few ml of biuret reagent is added to the unknown sample for detection of albumin. A colour change from blue to violet or dark blue will indicate the presence of albumin (protein).

Sudan III Test for identification of lipids.

Sudan III is a dye used to give colour to non-polar substances. Sudan III test is used in general lab for detection of lipids in unknown solution. Sudan III is red brown in colour and will stain the oil red when comes in contact in a solution. It will form 2 layers, one will be oil with red layer and the other is water layer.

1. Which macromolecules were present in the unknown solution? In the milk?

As pure milk composed of Fat, carbohydrate’s and Proteins. So for detection of milk all tests are recommended.

Biuret test for detection of protein

Benedicts test for carbohydrates

Sudan III test for detection of fats.

So positive results for all above will indicate the presence of milk.

. 2.What was the role of the water test tube in each phase?

Water is used as a negative control in each step and will give negative results as compared to all the colour change results. Water role in all phases is its comparison with all the other unknown samples as we know that there are no macro molecules in water sample.

8 0

3 years ago

Colorblindness is a sex-linked recessive trait. If B=normal and b=colorblind, what would be the genotype of a normal male? Quest

Flauer [41]

Answer:

The Genotype of a normal male wil be: XBY.

Explanation:

A sex linked recessive disorder is expressed only in males because males have only one X chromosome and so only one allele for this gene can be present in them.
Hence, if the recessive allele is present then colour blindness will occur.
If the dominant allele is present then the male will be normal.
XbY has a recessive allele so the male with this genotype will be color blind.
XBYb cannot be aoption because Y chromosome cannot have the allele of the gene.
XBXb is a female carrier's genotype.
XBY has the dominant allele and so the man with this genotype will be normal.

3 0

3 years ago

The frequency of a lethal allele in a population is greatest when it is: Group of answer choices dominant manifested in infancy

bonufazy [111]

Answer:

recessive

Explanation:

A lethal allele is a gene variant associated with a mutation in an essential gene, which has the potential to cause the death of an individual. In general, lethal genes are recessive because these alleles do not cause death in heterozygous individuals, which have one copy of the normal allele and one copy of the allele for the lethal disease/disorder. In recessive lethal diseases, heterozygous individuals are carriers of the recessive lethal allele and can eventually pass the 'defective' allele on to offspring even though they are unaffected; whereas dominant lethal diseases are caused by dominant lethal alleles, which only need to be present in one copy to be fatal. In consequence, the frequency of recessive lethal alleles is generally higher than dominant lethal alleles because they can be masked in carrier individuals. Some examples of human diseases caused by recessive lethal alleles include, among others, Tay-Sachs disease, sickle-cell anemia, and cystic fibrosis.

7 0

3 years ago