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posledela
3 years ago
8

List 3 ways molecules cross a cell membrane without using energy

Biology
1 answer:
harkovskaia [24]3 years ago
5 0
1. Diffusion
2. Osmosis
3. Facilitated Diffusion
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the phenotype frequency in a population changes after each generation . which would most likely cause this?
Gnesinka [82]

Answer:

Organisms compete for shelter  

Explanation:

Just took the test and answered this

6 0
3 years ago
some heterozygous alleles create variations in expression so that there is not a clear dominant or recessive allele true or fals
Simora [160]

Answer: False

 The variations in expression depends on how genes code for proteins that would specify whether it will be dominant or recessive allele.   Within a population, there may be a number of alleles for a given gene and these differences can cause variations in the protein that is produced. The change in protein expression affect traits due to the variations in protein activity or expression that produce different phenotypes.

<span>Moreover, individuals that have copies of different alleles are known as heterozygous and individuals that have two copies of the same allele are referred to a homozygous. The expression patterns observed in inheritance will depend on whether the allele is found on an autosomal chromosome or a sex chromosome, and on whether the allele is dominant or recessive.</span>

 

7 0
3 years ago
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in an organism a muscle cell has the same DNA as a nerve cell yet the cells perform different functions this is possible
Darina [25.2K]
This is possible by having different stem cells for different types of cells which then have different genes activated to make cells different
6 0
3 years ago
What is the purpose of spindle fibers during mitosis?
Sonja [21]

Answer:

I think the answer Is divide the cell in half and see the explanation

Explanation:

Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during both types of nuclear division: mitosis and meiosis

6 0
2 years ago
Why should you use sunscreen and a hat when you are outside in the sun
damaskus [11]

Answer: It is not healthy.

Explanation:

Wearing a hat shields your eyes from the sun, which can cause your retinas to burn, this is why sunglasses are also recommended, it helps stop too much light from entering your eyes, as well as UV rays.

Wearing sunscreen can protect your skin from harmful sun rays. These harmful sun rays can cause skin cancer by putting a protective layer over the skin.

Please rate my explanation

3 0
1 year ago
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