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3 years ago

12

What is one difference between a cell wall and a cell membrane?

1 answer:

vampirchik [111]3 years ago

8 0

A cell wall is fully permeable.
A cell membrane is partially permeable.

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Enzymes______the activation energy threshold required to start a chemical reaction.

vivado [14]

I believe it's Lower.

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3 years ago

Choose the best description for the prokaryotic cells.

natali 33 [55]

Answer:

has no nucleus; found in unicellular organisms

Explanation:

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3 years ago

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Why do our bodies need nitrogen?

jonny [76]

Well, Nitrogen is an important part of our bodies, Amino adcids all contain nitrogen there like building blocks that make protiens in your hair, muscles, and other tissues, Nitrogen is also and important part of your DNA.

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3 years ago

Define atomic number, atomic weight and atomic mass.

lozanna [386]

Atomic number shows the number of protons in the nucleus of an atom.
Atomic weight shows the is an another term for atomic mass, which means <span>It is approximately equivalent to the number of protons and neutrons in the atom (the mass number) or to the average number allowing for the relative abundances of different isotopes.</span>

6 0

3 years ago

Lila is a track and field athlete. She must complete four laps around a circular track. The track itself measures 400 meters fro

tekilochka [14]

Answer: Her speed is 4.4 m/s, and her velocity is 0 m/s.

Explanation:

Formulae : $\text{Speed}=\dfrac{\text{Distance}}{\text{Time}}$

$\text{Velocity}=\dfrac{\text{Displacement}}{\text{Time}}$

Given: Length of track start to finish= 400 meters

After completing its 4 laps, total distance covered = 400 × 4 = 1600 meters

Time taken by Lila = 6 minutes

= 6 × 60 seconds [There are 60 seconds in 1 minute.]

= 360 seconds

Then, $\text{Speed}=\dfrac{1600}{360}=\dfrac{40}{9}m/s$

$= 4.44\ m/s$

But from start to finish displacement = 0 m [displacement is the shortest distance between starting point to the finishing point]

So, $\text{Velocity}=\dfrac0{360}=0\ m/s$

Hence, Her speed is 4.4 m/s, and her velocity is 0 m/s.

8 0

3 years ago