BIOLOGY COLLEGE

Which description best explains Watson and Crick's DNA model?

Answers

Answer 1
Answer:

Answer: Double Helix model of DNA

Explanation: Which description best explains Watson and Crick's DNA model?. A:DNA single stranded molecule that has nitrogenus base towards its exterior . . B:DNA is a double-helix made of 2 strands linked together with hydrogen bonds . C:DNa is a double-helix that contains nitrogenious bases towards its exterior.

The double Helix model of DNA proposed by Watson and Crick is the most widely accepted model for the structure of the DNA. It features a right-handed double stranded polynucleotide DNA with molecules spirally twisted around each other and coiled around a common axis. Consisting of two sugar-phosphate backbones on the outside, it is bounded together held by hydrogen bonds between pairs of four nitrogenous bases (A, C, G and T) on the inside with pairing occurring always between A and T and, C and G.

Answer 2
Answer: Two twisting strands of paired nucleotides

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What phenotypic ratio would you expect as a result of a test cross between two individuals where 9) one that is homozygous recessive for alleles at two independent loci?
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The buoyant force acts in all directions.Please select the best answer from the choices provided

T
F

Answers

the first option is correct (true).

the greater the surface area of an object the greater the buoyant force.

Answer:

This is false so option 2 (F)

Explanation:

On edge 2021 it even says false.

In humans alkaptonuria is a metabolic disorder in whichaffected persons produce black urine. Alkapotonuria results from anallele(a) that is recessive to the allele for normal metabolism(A). Sally has a normal metabolism, but her brother hasalcaptonuria. Sally's father has alcoptonuria, and her mother hasnormal metabolism. a) Give the genotype of Sally,her mother,father and herbrother.
b) If Sally's parents have another child what is theprobabilty that this child will have alkaptonuria?
c) If Sally marries a man with alkaptonuria, what is theprobability that their child will have alkaptonuria?

Answers

If Sally marries a man with alkaptonuria, there is a 50% chance that  their child will have alkaptonuria.

The genotype of an individual refers to the sum total of genes that the individual received from its parents. Since Sally has a normal metabolism, Sally is Aa. Sally's mother is Aa while Sally's father and brother are aa.

If Sally parents have another child, using the Punnet square method, there is a 50% chance that the child will have alkaptonuria. If Sally marries a man with alkaptonuria, there is a 50% chance that  their child will have alkaptonuria.

Learn more: brainly.com/question/9743981

a) Genotypes: : Aa (carrier of the alkaptonuria allele) ,Mother: Aa (carrier of the alkaptonuria allele)Father: aa (has alkaptonuria)Brother: aa (has alkaptonuria)

b) If Sally's parents have another child:The probability of the child having alkaptonuria (aa genotype) is 25%.The probability of the child being a carrier (Aa genotype) is 50%.The probability of the child having normal metabolism (AA genotype) is 25%.

c) If Sally marries a man with alkaptonuria (aa genotype):The probability of their child having alkaptonuria (aa genotype) is 50% (as Sally is a carrier).The probability of the child being a carrier (Aa genotype) is 50%.

The probability of the child having normal metabolism (AA genotype) is 0% (as the husband has alkaptonuria).

Sally: Aa (normal metabolism carrier)

Mother: Aa (normal metabolism carrier)

Father: aa (alkaptonuria)

Brother: aa (alkaptonuria)

b) If Sally's parents have another child:

Probability of the child having alkaptonuria (aa genotype) is 25%.

Probability of the child being a carrier (Aa genotype) is 50%.

Probability of the child having normal metabolism (AA genotype) is 25%.

c) If Sally marries a man with alkaptonuria (aa genotype):

Probability of their child having alkaptonuria (aa genotype) is 50% (as Sally is a carrier).

Probability of the child being a carrier (Aa genotype) is 50%.

Probability of the child having normal metabolism (AA genotype) is 0% (as the husband has alkaptonuria).

For such a more question on Genotypes

brainly.com/question/30460326

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Compare and contrast aspergillosis and mucormycosis.

Answers

Answer:

Aspergillosis and Mucormycosis are caused by two different fungi groups.

Explanation:

Aspergillus causes Aspergillosis. Aspergillus is a kind of mold or fungus which is found in both inside and outside environment and it may not always cause the disease if inhaled.

Mucormycosis is caused by Mucormycetes. Mucormycetes are group of fungi that are specifically found in soil and other decaying organic matter like leave, animal dung etc. They are more common in soil as compared to air. People with weak immunity system usually are affected by this fungi else these fungi's are not very harmful. They cause an infection in lungs/sinuses when inhaled

Identify the structure of the human heart which is a valve between the aorta and the left ventricle of the heart that prevents the blood from flowing back into the left ventricle. (check out the hint)

Answers

The answer it's (B) aortic valve
The valve that prevents blood from flowing back into the aorta is the aortic valve. 

What is the y intercept of the line with the equation 4x + 2 = 12

Answers

4x-2y=12  

plug in 0 to find y or x intercept: 4x-2(0)=12 4(0)-2y=12

4x=12 2y=12

x=2 y=-4

(2,0) (0,-4)

so the y-intercept is -4 and x-intercept is 2

What are some of the differences and similarities between a plant cell and an animal cell

Answers

Animal cells are mostly round and irregular in shape while plant cells have fixed, rectangular shapes. Plant and animal cells are both eukaryotic cells, so they have several features in common, such as the presence of a cell membrane, and cell organelles, like the nucleus, mitochondria and endoplasmic reticulum.

Answer:                        (5 differences)

A plant cell is larger than an animal cell. The shape of a plant cell is a fixed rectangular shape, whereas an animal cell is mostly round and irregular in shape. Plant cells store energy in the form of scratch while animal cells store energy in the form of complex carbohydrates and glycogen.

                                       (5 similarities)

Image result for What are some of the differences and similarities between a plant cell and an animal cell

Both animal and plant cells are eukaryotic cells and have several similarities. The similarities include common organelles like cell membrane, cell nucleus, mitochondria, endoplasmic reticulum, ribosomes and golgi apparatus.                                                                      

Explanation:

Did Me Well Anyways The Answer Before Me Is a Complete Internet Search First Page On The Web.
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