Let’s brush up on mapping. For questions 1-8, pure-breeding P0 animals were mated to generate F1 animals heterozygous at the B and W genes. The heterozygous F1 animals were test-crossed and yielded progeny with the phenotypes below. Mutations in the B gene (b) cause a “no bristles” phenotype. Mutations in the W gene (w) cause a “no wings” phenotype. Both genes are haplosufficient. 45% normal bristles, normal wings 45% no bristles, no wings 5% no bristles, normal wings 5% normal bristles, no wings The numbers above suggest that the B and W genes are linked. What ratio of progeny would you have expected to see if B and W were on different chromosomes?


Answer 1


When DNA is duplicated during mitosis, _____.

one completely new DNA molecule is formed

two completely new DNA molecules are formed

two molecules are formed, each with one original side

the original molecule thickens and separates into two


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What are three organic compounds that make up the cell membrane


The three organic compounds that make up the cell membrane are carbohydrates, proteins and lipids.

  • The main components of the cell membrane are lipids (phospholipids and cholesterol).

  • Lipids are a broad category of biomolecules composed of fatty acids and a glycerol backbone.

  • Membrane proteins are proteins that form part of the cell membranes, which can be classified into two classes: integral (intrinsic) membrane proteins and peripheral (extrinsic) membrane proteins.

  • Proteins are biomolecules composed of amino acids as building blocks linked by peptide bonds.

  • In the cell membrane, carbohydrates are linked to proteins (i.e., they form glycoproteins) or lipids (i.e., they form glycolipids).

  • Carbohydrates are biomolecules composed of monosaccharides linked by glycosidic bonds.

In conclusion, the three organic compounds that make up the cell membrane are carbohydrates, proteins and lipids.

Learn more in:

Cell membranes are made of many things, however, for your question,

Phospholipids make up the largest portion.

Proteins span and line the membrane.

Cholesterol can be found in the phospholipid bilayer.

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This characteristic of hydrogen and oxygen make the water molecule polar: ______. reactivity or electronegativity sceince


Answer: I think positive electrical charge

Explanation: Water molecules have a polar arrangement of the oxygen and hydrogen atoms—one side hydrogen has a positive electrical charge and the other side oxygen had a negative charge. This allows the water molecule to become attracted to many other different types of molecules.





Roger went on a diet a few months before wrestling season. Through careful eating and daily exercise, he lost eight pounds of fat in two months. What happened to the "weight" or biomass that Roger lost?


The weight that Roger lost was already used up by the body for energy through certain chemical processes. The weight was also loss through the release of carbon dioxide through the process of exhalation during the exertion of force in activities. These are the reasons why he has loss such biomass.

Select the answer that has the correct order of the steps of the scientific method.


The answer to this quetsion is A. The scientific methid is a very scientific method. And it is ordered in a scientific way.
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