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VikaD [51]
2 years ago
10

What is the unit of muscular contraction called?

Biology
1 answer:
MaRussiya [10]2 years ago
8 0
A sarcomere is the basic contractile unit of muscle fiber. Each sarcomere is composed of two main protein filaments—actin and myosin—which are the active structures responsible for muscular contraction. The most popular model that describes muscular contraction is called the sliding filament theory.
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Assume that the mutation rate for a given gene is 1 × 10−6 mutations per generation. For that gene, how many mutations would be
sertanlavr [38]

Answer:

500

Explanation:

Mutation rate is largely known as changes that occur in the frequency of a particular gene over an extended period of time

So given that;

the  mutation rate of a particular gene = 1 × 10⁻⁶

The expected mutations after 500 million sperm are examined will be:

= (1 × 10⁻⁶)×(500,000,000)

= 500

Thus, The expected mutations  = 500

5 0
3 years ago
ancestors of giraffes with shorter necks could not reach branches high up in trees for food. this led to selection for longer-ne
hichkok12 [17]

With shorter necks, giraffe ancestors could not reach food-containing branches on tall trees. This resulted in the directional selection of giraffes with longer necks.

 

<h3>Why is choosing a direction necessary? </h3>

It nearly appears obvious that the giraffe's long neck developed as a result of a lack of food in the lower branches of trees. The giraffe has a significant advantage because it is taller than any other mammal and can feed where few others can. 

When compared to modern giraffes, the giraffe's ancient predecessors had a shorter neck. The plants that were lying at a higher level were inaccessible to them. Giraffe phenotypes have changed in various ways, and now have long necks to reach vegetation that is higher up. The extreme form is chosen above other features in directional selection. It was decided to choose the long-necked giraffe over the short-necked.

 

To know more about direction selection for longer necked giraffes visit:

brainly.com/question/3738222

#SPJ4

7 0
1 year ago
What is ATP, and when is energy released from it? ​
Misha Larkins [42]

ATP is Adenosine Triphosphate. ATP consists of an adenosine molecule bonded to 3 phosphate groups in a row. This occurs when a molecule of adenosine diphosphate ( ADP ) uses the energy released during cellular respiration bond with a 3rd phosphate group, becoming a molecule of ATP

7 0
3 years ago
At the salinity of average seawater, what happens to density as the temperature increases? Is this also true of fresh water? Bra
ivanzaharov [21]

Answer:

The density of water increases as the salinity increases. The density of seawater (salinity greater than 24.7) increases as temperature decreases at all temperatures above the freezing point. The density of seawater is increased by increasing pressure.

Explanation:

5 0
2 years ago
What is an outcome of lack of oxygen?​
siniylev [52]

Answer:

Brain cells are very sensitive to a lack of oxygen. Some brain cells start dying less than 5 minutes after their oxygen supply disappears. As a result, brain hypoxia can rapidly cause severe brain damage or death.

Explanation:

Other symptoms can include: hallucinations and delusions; increased agitation and confusion; depression and other mood disorders; personality changes, such as irritability and a reduced threshold for frustration; and an inability to focus or concentrate.

4 0
3 years ago
Read 2 more answers
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