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saveliy_v [14]
3 years ago
13

For excitation-contraction coupling, which of the following is/are required? and Why?

Biology
1 answer:
mihalych1998 [28]3 years ago
6 0

a). Calcium ion and ATP

Explanation:

The excitation and contraction of the muscles takes place by Action potential  creation.

The muscle contraction is initiated when calcium ions binds to troponin. The binding of calcium with protein complex troponin changes the configuraton to  make actin sites active for ATP binding. This binding causes myosin to reach the state of high energy ( excitation), in which myosin head gets detach from the active site.

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Match the functional groups with their structures:
evablogger [386]
The true answer of your question is :

OH : HYDROXYL GROUP

NH2 : AMINO GROUP

CH3 : METHYL GROUP ( but in rather broader terms, that functional group of formula CnH2n+1 where n is an integer is called ALKYL GROUP where by substituting n by 1,2,3... we obtain methyl for n = 1, ethyl for n = 2, and propyl for n = 3 )

COOH : CARBOXYL GROUP is the correct answer since carbonyl is characterized by the presence of functional group C=O in general the formula of the compound would be
R-C=O-R’ where R and R’ are alkyl groups like methyl for example. However the carboxyl group could be thought of as a summation of carbonyl + hydroxyl ( CO + OH ) resulting thus in COOH.

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7 0
3 years ago
Lower temperatures lead to slower soil formation.
MAVERICK [17]
<span>It is true that lower temperatures lead to slower soil formation. The lower the temperature in the air is, the slower the soil is going to form. In order for soil to form properly and completely, it needs to have some warmth because heat helps this process run faster. </span>
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What gender is this duck?
Dominik [7]

Answer:

Female

Explanation:

Females typically don't have the curly tail at the end and this photo shows there are not any so I'm pretty sure it's a female.

7 0
3 years ago
How might a mutation benefit the cell that inherits the mutation?
stellarik [79]

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Explanation:

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Which of these is heated by radiation? A. An ice cube melts while you hold it in your hand. B. Hot soup rises to the top of the
blondinia [14]

Answer:

Answer is option D.

The sun's energy is transferred through the vacuum of space to Earth by radiation.

Explanation:

The three forms of heat transfer are conduction, convection and radiation. The process of heat transfer between two solid objects in contact with one another due to a temperature difference is known as conduction. An ice cube melts while you hold it in your hand, is an example of conduction. Here, the heat energy from the hand is transferred to the ice cube and the ice melts.

Convection is the heat transfer occurs in moving materials (liquid or gas) due to the temperature difference between two regions. Hot soup rises to the top of the bowl, while cooler soup sinks to the bottom is an example of convection. The hot soup is less dense than cold soup, so it rises to the top and the cold soup at the top sinks to the bottom.

Radiation is a form of heat transfer where the heat energy is transferred through electromagnetic waves like infrared, UV rays etc. The sun's energy is transferred through the vacuum of space to Earth by radiation. Heat energy is transferred through vacuum by infrared radiation emitted by the Sun. The Earth absorbs it and turns the energy into heat.

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