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4 years ago

Identify 2 characteristics of the alveoli that facilitate gas exchange and infer their significance for their process

2 answers:

3 0

First, in the lungs are150 a million alveoli (very large surface area) which mean more oxygen is taken in.
<span>Second, of all, the alveoli are covered in capillaries, meaning that gas exchanges happen extraordinarily fast - with each breath.</span>

spayn [35]4 years ago

3 0

First of all, humans have their two lungs to breathe, which are covered in over 150 million alveoli, meaning a very, very large surface area, which means more oxygen is taken in.

Second of all, the alveoli are covered in capillaries, meaning that gas exchanges happen extraordinarily fast - with each breath.

So, yes, they add up to create a large surface area and are covered in capillaries.

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What do you believe is causing the decline in oyster harvest in the Louisiana golf coast?

Mrrafil [7]

Answer:

The cause of their decline is most likely due to a combination of factors cited in the media

Explanation:

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2 years ago

What substance is used in medicine to produce various images of organs and tissues?

dybincka [34]

The substance like iodine 131 is used as in medicine which can help produce various images of organs and tissues. This substance is called as a tracer. Iodine 131 is a radioactive isotope which is also used to monitor thyroid gland functioning, to locate tumours in the liver or brain, and also treat thyroid cancer.

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3 years ago

9. Briefly describe how each of the following mutations would affect gene expression and/or phenotype: Reactive oxygen species h

REY [17]

Answer:

<h2>G-A mutation is a point mutation in which one nucleotide is replaced by another nucleotide, it is an example of Transition mutation (a base substitutions that changes a purine nucleotide to another purine.</h2>

Explanation:

1. Defective Mitochondrial Gene Expression Results in Reactive Oxygen Species (ROS).

2. Elevated production of reactive oxygen species (ROS), and increased oxidative stress, results in defects in proper functioning of cell by causing mutation in the DNA and mitochondrial genes.

3. If the mutation is silent mutation, then there is no harm or less harm in the cell, if the mutation is missense or nonsense type then it can affect the functioning of the cell and phenotype of that organism.

4. If their is mutation in mitochondrial tRNA gene, it can affect the translation of mitochondrial mRNA and gene expression.

5 0

3 years ago

Which structures in male produce fluids that mixes with sperm to form semen

Gnom [1K]

Explanation:

The testicles. Lol or Penis. Imma try to be mature

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4 years ago

Different ratios occur in crosses with single gene pairs or two gene pairs. What types of ratios are likely to occur in crosses

likoan [24]

Answer:

Genotype ratio: 1, 1:1, 1:2:1

Phenotype ratio: 1, 3:1

Explanation:

Single gene pair cross is also known as monohybrid cross. This means that only one gene usually with two alleles is observed and it express one trait.

For example, if we name the gene for a certain trait with A, the possible genotypes are AA (dominant homozygous), aa (recessive homozygous) and Aa (heterozygous). Possible crosses are:

P: AA x AA

F1 : all of them are AA

The same is with aa x aa (all of the offspring are with aa genotype)

P: AA x Aa

F1: AA Aa AA Aa (genotype ratio 1:1) (phenotype ratio 3:1)

The same genotype ratio is in aa x Aa (offspring will have aa Aa aa Aa-(genotype ratio 1:1) (phenotype ratio 1:1)

P: Aa x Aa

F1: AA Aa Aa aa (genotype ratio 1:2:1) (phenotype ratio 3:1)

P: AA x aa

F1: Aa Aa Aa Aa (1)

5 0

3 years ago