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3 years ago

How do prokaryotic cells replicate?

Physics

1 answer:

Alika [10]3 years ago

6 0

Answer:

The usual method of prokaryote cell division is termed binary fission. The prokaryotic chromosome is a single DNA molecule that first replicates, then attaches each copy to a different part of the cell membrane. When the cell begins to pull apart, the replicate and original chromosomes are separated.

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the moon orbits the earth in an average time of 27.3 days at an average distance of 384000 km. use these facts and newtons versi

natulia [17]

Answer:

The mass of the Earth is $6.02x10^{24}Kg$ .

Explanation:

The Universal law of gravitation shows the interaction of gravity between two bodies:

$F = G\frac{Mm}{r^{2}}$ (1)

Where G is the gravitational constant, M and m are the masses of the two objects and r is the distance between them.

For this particular case, M is the mass of the Earth and m is the mass of the moon. Since it is a circular motion, the centripetal acceleration will be:

$a = \frac{v^{2}}{r}$ (2)

Then Newton's second law ( $F = ma$ ) will be replaced in equation (1):

$ma = G\frac{Mm}{r^{2}}$

By replacing (2) in equation (1) it is gotten:

$m\frac{v^{2}}{r} = G\frac{Mm}{r^{2}}$

$v^{2} = G\frac{Mmr}{mr^{2}}$

$v^{2} = \frac{GM}{r}$ (3)

Since it is a circular motion, the orbital velocity can be represented by:

$v = \frac{2\pi r}{T}$ (4)

Where r is the orbital radius and T is the period.

Then, equation 4 can be replaced in equation 3.

$(\frac{2\pi r}{T})^{2} = \frac{GM}{r}$

$\frac{4\pi^{2} r^{2}}{T^{2}} = \frac{GM}{r}$

Notice that r can be represented by the semi-major axis (a)

$\frac{4\pi^{2} a^{2}}{T^{2}} = \frac{GM}{a}$

$T^{2}GM = 4\pi^{2} a^{2} a$

$T^{2} = \frac{4\pi^{2} a^{3}}{GM}$ (5)

Therefore, the mass of the Earth can be determined if M is isolated from equation (5):

$M = \frac{4\pi^{2} a^{3}}{GT^{2}}$ (6)

Notice that it is necessary to express a in units of meters and T in units of seconds.

$a = 384000Km . \frac{1000m}{1Km}$ --- $3.84x10^{8}m$

$T = 27.3days . \frac{24hrs}{1day}$ --- $655.2hours.\frac{3600s}{1hour}$ --- $2358720s$

$M = \frac{4\pi^{2} (3.84x10^{8}m)^{3}}{(6.67x10^{-11}kg.m/s^{2}.m^{2}/kg^{2})(2358720s)^{2}}$

$M = 6.02x10^{24}Kg$

Hence, the mass of the Earth is $6.02x10^{24}Kg$ .

6 0

3 years ago

Autorhythmic cells can generate action potentials spontaneously because they have Autorhythmic cells can generate action potenti

OlgaM077 [116]

Answer:

They can generate potentials spontaneously because they have Unstable Membrane Potentials.

Explanation:

Autorythmic cells or Pacemaker cells are cells that provide Action potentials (electrical impulses) that starts off the cardiac cycle.

N:B This action potential is created spontaneously.

To explain further, the heart originate in specialized cardiac muscle cells, called autorhythmic cells, that can excite themselves and therefore are able to generate an action potential without external stimulation by nerve cells. And this sets the cardiac cycle i

(Pumping of the heart) into motion. (The pace maker potential)

The Autorhythmic cells create an action potential spontaneously

And this is possible because they have an UNSTABLE RESTING POTENTIAL that is continuously depolarizing, while it drifts slowly toward threshold. As Na+ ions enter the cell, the inner surface of the plasma membrane becomes less negative gradually, thus generating the pacemaker potential.

8 0

3 years ago

Read 2 more answers

A police siren has a frequency of 340.0 Hz when the car is stationary and the temperature is 20°C. The police car at point S mov

hodyreva [135]

Answer:

a) 361.7 Hz

b) 318.1 Hz

c) 29.3 m/s

Explanation:

a) Speed of sound in 20 degrees celcius is 343 m/s.

Use v=wavelength*frequency to find wavelength.

343=wavelength*340

wavelegth=1.009 meters

Relative speed of waves to observer A = 343+22 = 365 m/s

Plug it back in.

365=1.009*F

F=361.7 Hz

b) Relative speed of waves to observer B = 343-22 = 321 m/s

Plug it back in.

321=1.009*F

F=318.1 Hz

c) STATIONARY CAR, so 369Hz=v/1.009. v=372.3, 372.3-343=29.3m/s!

8 0

3 years ago

Pls do 6 7 8 and 9. Pls

Airida [17]

Answer:

6 The earth come between the sun and moon

7 Full moon

8 entire night side of the earth.

9 The earth atmosphere acts as a prism and filter refracting longer wavelengths of sunlight enough to color the muted reflections from the moon.

Explanation:

7 0

3 years ago

This type of electricity is produced when objects give up or gain electrons and

solniwko [45]

Answer: Static Electricity

6 0

3 years ago