In humans, the allele for a widow’s peak is dominant to the allele for a straight hairline. In a family with three children, two of the children have a straight hairline and one child has a widow’s peak. Which of the following is possible?
a. Both parents are homozygous for a straight hairline.
b. Both parents are homozygous for a widow’s peak.
c. One parent is homozygous for a straight hairline, and the other is heterozygous.
d. One parent is homozygous for a widow’s peak, and the other is homozygous for a straight hairline. ...?

I think that the answer is A.

The carp out-compete the native species for food and space.

As an invasive species. Some species of Asian carp cause harm when they are introduced to new environments. The black carp feeds on native mussels and snails, some of which can be already endangered. Grass carp can alter the food webs of a new environment by altering the communities of plants, invertebrates, and fish.

The correct answer is option a. 25%.

We need to find out the brown colored cats with long tail.

So, the genotype of the individual must have atleast one B allele and ss allele.

From the punette square given above

The number of offspring having Bbss or Bsbs is 4.

Total number of the offspring is 16.

So, the probability of the brown cat with a long tail is [tex]\frac{4}{16} =\frac{1}{4}[/tex] =25%.

Hence, the brown cat with a long tail are 25% of the total population

Answer:

Option (B)

Explanation:

When the initially occurring aquatic organisms such as the blue-green algae started to use the solar energy in order to convert the water molecules and carbon dioxide and converting them into organic compounds as well as the molecular oxygen (O₂). This is known as the photosynthesis process that produced a significant amount of oxygen in the atmosphere. These oxygen molecules, as absorbs the UV radiations emitted from the sun, it breaks the oxygen molecules and forms a single atom of oxygen. These atoms then again is added to the molecular oxygen and forms the ozone (O₃) molecule.

This is how the ozone layer has formed about 2 billion years ago.

Thus, the ozone layer did not form during the Cenozoic era.

Hence, the correct answer is option (B).

The correct answer is A

The scientist can determine that this nucleic acid is a DNA molecule, because it contains Thymine, which does not occure in the RNA molecule. The RNA molecule contains Adenine, Guanine and Cytosine just like the DNA, but unlike the DNA it contains Uracil, not Thymine.

Secondly, the scientist can say with certainty that this DNA molecule is surrounded by a nucleus based on the structure of the nucleic acid described. Only eukaryotic cells have ladder structure. The prokaryotic cells have circular DNA and do not have any organelles, like the nucleus. Therefore, from the ladder structure of the DNA the scientist can see that the cell has a nucleus.

Answer:

C

Explanation:

edge 2020

Answer: The correct answer is D) DNA is in a nucleus in eukaryotes.

Prokaryotes are those organisms that lack a well defined nucleus and membrane bound subcellular organelles (like endoplasmic reticulum, golgi complex, mitochondria). The genetic material lies in the cytoplasm of the cell in these organisms.

Example - Bacteria like E.coli.

On the other hand, eukaryotes are those organisms that contain a well defined nucleus that possesses the genetic material (DNA). These organisms also contain membrane bound subcellular organelles.

Example - Plants and animals.

The DNA (Deoxyribose nucleic acid) of the eukaryotes is different from that of prokaryotic DNA based on their nuclear structure, a number of a chromosome, their binding protein, and selective permeability.

Further Explanation:

The difference between prokaryotic cells and Eukaryotic cells are listed in Table 1 attached below:

Learn More:

Answer Details:

Grade: High School

Subjects: Biology

Topic: Structure of DNA

Keywords:

Eukaryotes, prokaryotes, chromosome, protein, cytoskeleton, membrane, histone, permeability, nucleus, condense, DNA, tetramers

fossil,nuclear,geothermal

The correct order of arrangement of energy resources from highest to lowest usage world wide is fossil fuels, nuclear energy and geothermal energy.

A fossil fuel is a energy source formed by the dead remains of living organims over millions of years through the natural process. It includes the coal, petroleum and the natural gas which are the highly used energy resources all over the world. Nuclear energy is the energy generated during the fission or fusion of nuclear reactions which is used to generate electricity. It is one of the low carbon power methods to generate electricity. Geothermal energy is the thermal energy or the heat energy stored in the earth which is used to produce electricity.

Thus, fossil fuels forms the first energy resource to be highly used worldwide.

Hydrogen bonds are responsible for the cohesiveness of water molecules. Cohesiveness is the tendency of molecules of a substance to stick together. In water, the molecules are held together by hydrogen bonds.

Hydrogen bonds are weak chemical bonds that form between the hydrogen atom of one water molecule and the oxygen atom of another water molecule.

The hydrogen bonds between water molecules are very weak, but they are very numerous. This means that a large number of water molecules are held together by these weak bonds, which gives water its cohesiveness.

The cohesiveness of water is a very important property that has many implications for the physical world.

To know more about Hydrogen bonds:

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Answer: The correct answer is- Endocytosis.

Endocytosis can be described as a process in which cell engulfs large molecules from the environment by fusing them with its cell membrane (plasma membrane).

Cell membrane is a selectively permeable, hydrophobic membrane. Large polar molecules ( such as proteins and hormones) can not pass through it by means of simple diffusion.

Cell performs endocytosis for taking in such large molecules.

In this process, plasma membrane first forms a pocket around the target molecule ( such as protein) through invagination and once it completely surrounds the molecule, it is pinched off in the cytoplasm in a form of food vacuole ( phagosome in case of solid particles).

Thus, Endocytosis is the right answer.

Answer:

acid form

Explanation:

The reason is because using a longer chromosome pair would help the learner to see the pattern in the spread out

Correct answer: A) Both cell walls provide structural support but fungi is made of polysaccharides and chitin and plants are made of cellulose.

The plant cell wall is made up of cellulose. It is a complex carbohydrate that is used for the protection and provides structural support to plants. The cell wall of plants has chloroplast.

While the cell wall of fungi does not have chloroplast, they possess a rigid layer of complex polysaccharides called as chitin. It is also known to be found in the exoskeleton of insects and it is known to provide strength to the fungal cell wall.

Hence, the correct answer would be option A.

Answer:

Vultures do not break down wastes, and only consume meat.

Plant cells in tissue culture change from undifferentiated mass to specialized cells, similar to animal stem cells.

When plant cells are placed in a medium for tissue culture, they undergo changes in terms of their degree of specialization. Initially, the cells form an undifferentiated mass known as callus, which is a mass of cells that have not yet specialized into specific cell types. However, over time, tiny roots, stems, and leaves start to grow from this mass as the cells differentiate and specialize into their respective cell types.

The undifferentiated plant cells in tissue culture are most similar to stem cells in animal tissues. Stem cells, like undifferentiated plant cells, have the ability to differentiate into various cell types and are capable of self-renewal. They are the foundation for growth and repair in animals, just as undifferentiated plant cells contribute to the growth and regeneration of plants.

In tissue culture, specialized plant cells de-differentiate into a less specialized, undifferentiated state known as a callus, similar to stem cells in animals.

In tissue culture, the plant cells placed in a medium change from being specialized and differentiated to a state of being undifferentiated or less specialized, forming a mass called callus. This process is akin to the meristematic cells found in plants, which are capable of continuous division and growth. The animal cells most similar to these undifferentiated plant cells are stem cells, particularly embryonic stem cells, which can also divide and differentiate into various cell types. This capacity for de-differentiation and subsequent re-specialization allows both plant tissue cultures and animal stem cells to be used for growth and regeneration of tissues.

Final answer:

In a DNA molecule, purines are bonded with pyrimidines. Adenine (A) bonds with Thymine (T), and Guanine (G) bonds with Cytosine (C).

Explanation:

In a DNA molecule, purines are bonded with pyrimidines. This means that Adenine (A), a purine, will always bond with Thymine (T), a pyrimidine. Similarly, Guanine (G), another purine, will always bond with Cytosine (C), a pyrimidine. The base pairs (A-T and G-C) are held together by hydrogen bonding, creating the double-stranded helical structure of DNA.

This plant response by specialized cells is called gravitropism.

Gravitropism is the growth of a plant’s organ in response to gravity. In the root cap of plants, there are specialized cells known as statocytes that contains granules known as statoliths which stimulate the production of auxin; a hormone that is important for controlling plant growth. Plants have the ability to sense gravity with the aid of these specialized cells and plant roots grow downward into the soil while stems grow in the opposite direction.