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s2008m [1.1K]
3 years ago
9

Retroviruses - Examples of RNA viruses are Cvid-19 or the virus that causes __

Biology
1 answer:
pentagon [3]3 years ago
6 0

Answer:

<h3>I think <em>death</em> but im not sure </h3>

Explanation:

------

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I will mark as the brainliest answer​
Natasha2012 [34]

Answer:

6: Texas, Oklahoma, Colorado, Nebraska, South Dakota, Iowa

7: Canada

8: Gulf of Mexico

9: Mexico

Explanation:

8 0
3 years ago
Cross bridge formation between myosin heads and actin molecules is caused by the elevation of calcium ion concentration in the c
almond37 [142]

Answer:

sarcoplasmic reticulum deteriorates and ATP production is stopped

Explanation:

Rigor mortis is the third stage of death characterized by stiffening of joints and muscles in body. The stiffening occurs because muscles are not able to return to the relaxed state. There are two reasons for rigor mortis, depletion of ATP and increase in calcium concentration in cytosol. Due to these factors the actin-myosin crossbridge is not able to break and the muscles remain in contracted state.

Sarcoplasmic reticulum deteriorates and calcium is released into the cytosol. Sarcolemma ( covering of muscle fiber ) also breaks down releasing extra calcium into the cytosol. Calcium is responsible for formation of actin-myosin cross bridge and when its concentration increases the bridge is formed continuously leading to stiffening of muscles and joints.  

3 0
3 years ago
A nucleus within an ascus undergoes meiosis, producing four haploid spores, which then undergo mitosis, producing eight haploid
natima [27]

Answer:

Four.

Explanation:

Initially four haploid spores are produced by meiosis. We know that during meiosis pairing between homologous chromosomes occurs and this created genetic difference between the divided cells. Exchange of genetic material doesn't occur during mitosis so mitotically divided cells are similar. Thus when spores divide by mitosis and become eight in number, here will be no new genetic difference.

The complete sentence will be -

A nucleus within an ascus undergoes meiosis, producing four haploid spores, which then undergo mitosis, producing eight haploid ascospores. These haploid ascospores contain a maximum of four different genetic types.

5 0
3 years ago
Why are viruses called obligate intracellular parasites?
ANEK [815]

Answer:

they servive only in living cells.

Explanation:

the virus are connecting link between living and non-living. they are unable to perform life process outside the living cells. outside the living cells, the viruses behave as simple chemical so they are called as obligate intracellular parasite.

8 0
3 years ago
Which energy source is renewable?<br> O A. Coal<br> O B. Nuclear<br> O C. Natural gas<br> O D. Wind
Jlenok [28]

Answer:

D. Wind

Explanation:

There is a limitless supply that is naturally produced

4 0
3 years ago
Read 2 more answers
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