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ivanzaharov [21]
2 years ago
13

In the initiation of muscle contraction calcium ions bind to tropomyosin exposing active sites on actin for crossbridge formatio

n
True or false
Biology
1 answer:
Anit [1.1K]2 years ago
7 0

This statement is true. To be more specific, the calcium ions bind to the troponin, which are attached to the protein tropomyosin. The tropomyosin then to shifts to expose the actin filaments to which myosin heads need to bind to produce contraction.

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You are determining the mass of an object using a triple beam balance. When the pointer is lined up with the zero mark, the ride
Nadusha1986 [10]
The mass of the object is the sum of the masses which shows the riders:
m = 300.00 g + 20.00 g + 8.00 g
m = 328.00 g
Answer:
The mass of the object is 328.00 grams.
3 0
3 years ago
List three ways the Earth is different today from when it was first formed.
MakcuM [25]
The three ways it would be different is the people geography and technology

4 0
3 years ago
How does cell wall help make a protein?
777dan777 [17]

Answer:

The cell wall sends signals for the cell to enter the cell cycle in order to divine and grow

Explanation:

The cell wall is porous allowing some substances, including proteins, to pass into the cell while keeping other substances out

7 0
3 years ago
In rabbits, short hair (S) is dominant over long hair (s). What genotype and phenotype ratios are expected from a cross between
irga5000 [103]

Answer:

Answer:

Genotype                  Phenotype                      

SS                 1/4          Short hair         3/4

Ss                 2/4         Short hair          3/4

ss                  1/4          Long hair          1/4

Explanation:

Both are heterozygous for the trait so we can expect that the cross would be:

Ss x Ss

   S     s

S  SS   Ss

s   Ss   ss

So the resulting off-spring would have the following genotype and phenotype:

1 out of 4 will have a genotype of SS.

2 out of 4 or half will have a genotype of Ss.

1 out of 4 will have a genotype of ss.

But because short hair is dominant the phenotype ratios would differ because Ss and SS would express short hair, so we add up their ration:

Short hair: 1/4 + 2/4 = 3/4

Long hair:  1/4

So in summary:

Genotype                  Phenotype                      

SS                 1/4          Short hair         3/4

Ss                 2/4         Short hair        

ss                  1/4          Long hair          1/4

Explanation:

7 0
3 years ago
Which of the following phase changes is an endothermic change?
kherson [118]

Answer: The correct answer is B) Vaporization.

A process is called endothermic when it absorbs energy from surrounding. In other words, if energy is consumed in any process then it is termed endothermic change. When any process releases energy in the surrounding then it is called exothermic process.

In vaporization, energy is absorbed by water molecules, which form vapors. Thus, it is an endothermic change.

On the contrary, in condensation, deposition, and freezing, the new bonds are being formed and thus energy is released in the surrounding. Therefore, they are exothermic process.

4 0
3 years ago
Read 2 more answers
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