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Rasek [7]
3 years ago
6

Which characteristic makes a cell membrane selectively permeable?

Biology
2 answers:
Feliz [49]3 years ago
7 0
Think about the building you're sitting in right now. What separates you from the outside world? The walls, right? They keep you safe from the elements, but they also let certain things in or out. In a classroom, the doors let students into the right classes, but can keep students out that belong somewhere else.
Let's look at how this translates to cells. Cells are the basic units of life that make up all living things. Cells, just like the rooms they are named for, have an outer barrier to keep the good stuff in and keep the bad stuff out. This barrier is called the cell membrane. The cell membrane has tiny gates that act like doors and windows in a room. This property of only letting certain things in and out is called selective permeability. Let's look closer at what this means.
Evgesh-ka [11]3 years ago
5 0

The cell membrane is said to be selectively permeable because it lets certain substances pass through while restricting the passage of others. The actual structure of the cell membrane allows free passage or restricts movement of substances across the membrane.



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Do you see a connection between wavelength and frequency? Explain.
katrin2010 [14]

Answer:

Wavelength and frequency of light are closely related. The higher the frequency, the shorter the wavelength. Because all light waves move through a vacuum at the same speed, the number of wave crests passing by a given point in one second depends on the wavelength.

Amplitude is the height of a wave which is the brightness of a light or loudness of a sound. So Frequency and Amplitude though are part of a wave are not dependent on each other. Their is no relation between frequency and amplitude.

Explanation:

hope it helps

8 0
3 years ago
In general what is the life cycle of a virus
KonstantinChe [14]

Answer:

Explanation:Many viruses follow several stages to infect host cells. These stages include attachment, penetration, uncoating, biosynthesis, maturation, and release. Bacteriophages have a lytic or lysogenic cycle.

8 0
3 years ago
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Flower color in snapdragons results from the amount of the pigment anthocyanin in the petals. Red flowers are produced by plants
USPshnik [31]

Answer:

The genotypes found in the F2 offspring will be An1An1, An1An2 and An2An2.

Explanation:

In the example given in the question, the color of the petals of snapdragon flowers are given with the An1 allele having full activity and the An2 allele being the null allele. For the F1 offspring, two snapdragon flowers are crossed, one with red petals which is An1An1 and one with ivory petals which is An2An2. All the genotypes for the F1 offspring will result in An1An2.

Then using this F1 offspring, the F2 offspring is found and the genotype of the F2 offspring will be An1An1 / An1An2 / An1An2 / An2An2.

So the genotypes found in the F2 offspring will be An1An1, An1An2 and An2An2. One red petal snapdragon, 1 ivory snapdragon and 2 pink snapdragons.

I hope this answer helps.

8 0
3 years ago
Description of esophagus
BartSMP [9]
1. Treatable by a medical professional
2. Requires a medical diagnosis
<span>3. Lab tests or imaging always required

Thank You, 
 Helpingothers


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5 0
3 years ago
What is a shooting star, a comet or a meteor burning in our Earth’s Atmosphere?
kolezko [41]

What do you mean by "What is a shooting star, a comet or a meteor burning in our Earth’s Atmosphere?"

edit: ohhhhh you are asking what a shooting star is...

its particles of comets or astoroids/metor enter the atmosphere at very high speeds and burn up

6 0
3 years ago
Read 2 more answers
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