A point mutation that changes a uac codon into a uag codon is a _____ mutation.

Biology

1 answer:

12345 [234]3 years ago

7 0

Answer:

nonsense mutation

Explanation:

A point mutation is a mutation within DNA sequence when a single nucleotide is changed (substitued, deleted, added). They can have various effects depending on the type of point mutation. For example, nonsense mutations are point mutations that result in a premature stop codon. UAC codon codes for the tyrosine amino acid, while UAG is stop codon. A s a consequence, protein product is usually unfunctional because it is incomplete.

Nonsense mutations can cause genetic disorders (e.g. thalassemia).

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List three protozoan infections of the circulatory system that are transmitted by arthropods. Include the disease name, specific

Kazeer [188]

Answer:

List three protozoan infections of the circulatory system that are transmitted by arthropods:

Malaria

Toxoplasmosis

Chagas disease (American trypanosomiasis)

Explanation:

Malaria is a prozotoan infection, that can be produced by several protozoan, in the genus Plasmodium. This Plasmodium infect red blood cells and the vector that trasmites it is the Anopheles mosquitoe. In this disease, red blood cells can have severe damage in different organs because of the hemolysis.

Toxoplasmosis is a disease caused by the protozoan Toxoplasma gondii. The main vector of them are domestic cats. When cats are infected, T. gondii oocysts is found in their feces and it can spread to humans. This disease is generally asymptomatic, except when the patient has AIDS or in pregnancy, which can be very dangerous and fatal.

Chagas disease, or American trypanosomiasis is caused by protozoan Trypanosoma cruzi and is generally transmitted to people thanks to the feces of triatomine bugs. Some of the acute symptoms include fever, vomiting, headache, and in severe cases people can develop a chronic disease. In the worst cases it can produce flaccid cardiomegaly (enlargement of the heart) leading to heart failure and death.

7 0

4 years ago

In the inner ear, a coiled tube called the __________ contains the receptor cells for hearing. A. Basilar B. Cochlea C. Pinna D.

maria [59]

Answer:

Cochlea

Explanation:

this is why they have cochlear implants

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2 years ago

Assume that tall (represented by T) is dominant over short stature (represented by y) in corn. If

aleksklad [387]

Answer:

a. 1 : 1

b. 1 : 1

Explanation:

In this case, a heterozygous tall plant (Ty) is crossed with a homozygous short plant (yy) - which we can deduce as the recessive alleles only exhibit themselves in the absence of the dominant alleles.

The resulting offspring would have the genotypes (refer to attached image):

Ty (Tall)

yy (short)

The genotypic ratio would be - 1:1 (Ty & yy are the genotypes present)

and the phenotypic ratio would be - 1:1 (tall and short are the phenotypes present)

<h3>Hope this helps</h3>