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Klio2033 [76]
3 years ago
15

Why is a stimulus required for a muscle to contract?

Biology
1 answer:
Charra [1.4K]3 years ago
7 0
When an individual muscle fiber receives a threshold stimulus, it contracts as much as possible. ... a threshold stimulus is the minimum amount of energy needed to make a muscle fiber contract.
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Biology Milestone/EOC Review
Snezhnost [94]

Answer:

Contractile

Explanation:

7 0
3 years ago
Eye pigment in a particular strain of fly is determined by two genes. An autosomal gene that controls the color of the pigments
Semenov [28]

RrXtXt×RrXTY is representing the cross between the white eyed female and red eyed male.

Option D

<h3><u>Explanation:</u></h3>

The genes that are discussed here both are completely dominant over their recessive alleles. In the autosome, the dominant R gene is responsible for red eye and recessive r gene is responsible for sepia eye. But in allosome, the dominant T gene allows the eye colour to be expressed and the recessive t gene doesn't allow eye colour to be expressed and makes it white.

As the female do have 2 X chromosomes and the female is white eyed, then both the chromosomes of female have t gene.

As the male is red eyed and have one X chromosome, so the male must have atleast one R gene in autosome to make the eye colour red and must have T gene in his X chromosome to make it appear in phenotype.

So the most possible cross that is given here is RrXtXt×RrXTY.

6 0
3 years ago
What does measles cause by​
omeli [17]

Answer:Measles is a highly contagious virus that lives in the nose and throat mucus of an infected person. It can spread to others through coughing and sneezing. If other people breathe the contaminated air or touch the infected surface, then touch their eyes, noses, or mouths, they can become infected.Measles is caused by a virus in the paramyxovirus family and it is normally passed through direct contact and through the air. The virus infects the respiratory tract, then spreads throughout the body. Measles is a human disease and is not known to occur in animals.

It usually begins as flat red spots that appear on the face at the hairline and spread downward to the neck, trunk, arms, legs, and feet. Small raised bumps may also appear on top of the flat red spots. The spots may become joined together as they spread from the head to the rest of the body.

Explanation:

7 0
2 years ago
Pls solve the biology questions
Harlamova29_29 [7]

Reviewing Main ideas

1. Replication assures that every cell has a complete set of identical, genetic information and makes a copy of the DNA so it can be passed to the new cell. ... DNA polymerase binds the nucleotides together and forms new strands complementary to each template.

2. DNA is a double helix. So during replication, it unwinds and separates into 2 strands. 1 strand will be called the non-coding and the other will be called the coding strand.

The non-coding strand will be the template for the new one.

3. The DNA Polymerase detects if there is an error, it removes the incorrect nucleotide and replaces it with the correct one.

Critical Thinking

4. The main function of DNA polymerase is to synthesize DNA from deoxyribonucleotides, the building blocks of DNA. ... By contrast, RNA polymerases synthesize RNA from ribonucleotides from either RNA or DNA. When synthesizing new DNA, DNA polymerase can add free nucleotides only to the 3' end of the newly forming strand.

5. Why is it important that human chromosomes have many origins of replication? because cells need to be copied quickly to replace cells in our bodies that have died, having many origins of replication helps the process happen faster.

The words that are in bold are the words you should write down. You don't have to write the whole thing. The other words are just for a better understaning.

4 0
2 years ago
Read 2 more answers
What is the goal of a conclusion?
kirill [66]

The goal of a conclusion is to state whether the hypothesis was supported by the data

Explanation:

A conclusion is a type of small paragraph where we explain the overall outcome of an experimental procedure and after it mention the proposed hypothesis at the starting of the experiment was correct or not.

These discussions which is mentioned in the conclusion is helpful for further experiments or also test that could be done to support your findings in the present experiment. This part could also be called perspectives.

4 0
3 years ago
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