Which is an appendicular bone? A. Vertebra B. Radios C. Cranium D. Rib

The generation of an action potential in a neuron requires the presence which type of membrane channels

valentina_108 [34]

The right answer is: voltage-gated channels

Ionic channels are membrane proteins that allow the selective passage of the cell membrane by ions (Na +, Ca2 +, K +, Cl-, ...) following the electrochemical gradients. They play a vital role in cellular excitability, triggering and propagation of action potential. They intervene in the coupling excitation-contraction and excitation-secretion. Ion channel selectivity is based on the adequacy of ion size and charges with the structure and amino acid sequence of the channels.

Among these channels, there are voltage-gated channels.

These are ion channels whose opening is activated by the membrane potential.

These dependent volumetric channels are characterized:

- by the selectivity of the ions (Ca2 +, Na +, K +, Cl-, ...)

- by their conductance

- by their activation domain (significant depolarization to low)

- by their kinetics of inactivation (slow, fast or transient)

4 0

3 years ago

In humans, aniridia, a type of blindness, is due to a dominant allele A. Migraine headaches are due to another dominant allele M

leonid [27]

Answer:

9/16

Explanation:

This is a typical dihybrid cross involving two genes; one coding for anridia (form of blindness) and the other for Migraine headache, both in humans. The allele for possessing anridia (A) is dominant over the allele for not possessing it (a) in the first gene, while the allele for having Migraine headache (M) is dominant over the allele for not having it (m) in the second gene.

A cross between a man that is heterozygous for both genes (AaMm) and a woman also heterozygous for the two genes (AaMm), this means that both parents are dominant for the two traits i.e. they both possess anridia and migraine headache.

Both parent cells will undergo meiosis to produce four possible combination of gametes in which the alleles are independent of one another in the gametes, according to Mendel's law of independent assortment. The gametes are: AM, Am, aM, am

These gametes are crossed using a punnet square (see attached image) to produce 16 possible offsprings in a phenotypic ratio of 9:3:3:1.

9- Offsprings with both anridia and migraine

3- Offsprings with only anridia but without migraine

3- Offsprings with only migraine but without anridia

1- Offsprings without both anridia and migraine

According to the question, the chance of an offspring expressing both traits i.e. having both anridia and migraine headache is 9/16

4 0

3 years ago

One advantage of a reflex response in the survival of an organism is?

ArbitrLikvidat [17]

your answer is C.

hope this helps :)

8 0

3 years ago

The total amount of organic matter present in any trophic level is called

Ilya [14]

It is called Biomass

4 0

3 years ago

Read 2 more answers

Ype the correct answer in the box. Spell all words correctly. What is the process of using natural resources efficiently to ensu

Marat540 [252]

Answer:

The correct answer is - Sustainable development.

Explanation:

Sustainable development is the process of using or utilizing the natural resources in the present in such an efficient way that there will be resources for future generations without compromising their needs.

It is essential in the current situation as people overexploiting the natural resources that it is quite possible there will very few resources will be left for future generations.

5 0

3 years ago