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valkas [14]
3 years ago
5

Can an ion move freely across a membrane? Explain.

Biology
1 answer:
nalin [4]3 years ago
3 0
Yes, Sodium ions pass through specific channels in the hydrophobic barrier formed by membrane proteins.Cossing the membrane is called facilitated diffusion

Hope this helps :)
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During what amphibian life cycle stage does the organism return to water with regular frequency to reproduce? metamorphic stage
ratelena [41]

Answer:

adult stage

Explanation:

adult reproduces

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3 years ago
imagine on your species of birds was introduced to the same area as a population of native birds what effacement the introduced
Llana [10]
They could compete for the same food resource or actually hunt the native bird, therefore decreasing the population of the Native bird species.

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A crop is treated with a pesticide and 98% of the insects are killed. what will most likely happen to the remaining insects?
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The 2% of the insects will begin to reproduce and grow their population exponentially and in time enable the population to recover. This is if the population is large enough to enable random mating. The 98% reduction in population drastically reduces competition for the remaining individuals hence giving them abundant resources for them to thrive.   






3 0
3 years ago
The condition Marfan syndrome results from the production of abnormal elastin, the main protein component of elastic fibers. Pre
Marina86 [1]

Answer:

Elastic fibers are made of elastin and microfibrils, that are elastic protein structures. The proteins can be stretched and resume normal shape. These fibers are found in parts of the body such as arteries, skin, lungs, connective tissue and heart that require some stretching. Marfan syndrome affects the elastic connective tissues causing symptoms like dilation of the aorta that doesn't resume normal lumen diameter (aortic aneurysm), and curving of the spine (scoliosis).

The lungs are unable to stretch and resume shape normally and this affects the respiratory system. The subjects will suffer from shortness of breath, wheezing and chest pain.

The sheath/endoneurium of neurons is connective tissue. This part of a neuron allows signals to travel effeciently along the axon of the neuron. This means that a person with Mafran syndrome has a slower response to stimuli that ordinary persons.

4 0
3 years ago
Use the information gathered in the Epistasis animation to answer the question. Although both dominance and epistasis involve ma
Dafna11 [192]

Dominance involves one allele masking another at the same locus whereas epistasis involves one locus masking a different locus.

Explanation:

Epistasis is a type of gene interaction in which one gene masks or modifies the expression of another gene at a distinct locus.

Dominance refers to the gene interaction in which one allele of a given gene masks the expression of another alllele of same gene.

The comparison of dominance and epistasis give the following  information:

  • Dominance  involves  allelic suppression while epistasis involves non-allelic suppression.
  • Dominance involves a single pair of alleles while epistasis involves two pairs of allele.
  • In dominance, the expression of recessive allele is suppressed while in epistasis, either recessive or dominant  non allele is suppressed.
  • The effect of dominance is due to the dominant allele while epistasis may be due to dominant or recessive allele.

8 0
3 years ago
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