Describe how the stages of mitosis result in the formation of two diploid cells (6 Marks)

Answer:

Females generally produce a few but large gametes, whereas males produce large numbers of much smaller gametes.

Explanation:

Answer: Prophase!

Explanation:

Answer:

to assist other lymphocytes

to kill cells infected with a virus or cancer

to help in the body’s immune response

Explanation:

Following are the functions of T-lymphocytes, here:

T-lymphocytes, also known as T cells, are a type of white blood cell that plays a key role in the immune system. They are produced in the bone marrow and mature in the thymus gland.

One of the main functions of T-lymphocytes is to assist other lymphocytes, such as B cells, in the immune response. They do this by releasing chemicals that help to activate and coordinate the immune response, and by directly attacking infected cells.

T-lymphocytes also have the ability to kill cells that are infected with a virus or cancerous cells. They do this through a process called cell-mediated immunity, in which they recognize and bind to specific proteins on the surface of infected cells. Once they have bound to the infected cells, they release chemicals that kill the cells, helping to prevent the spread of the infection or cancer.

T-lymphocytes are an important part of the body's immune system and play a vital role in helping to protect the body against infections and disease.

Learn more about T-lymphocytes, here:

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Answer:

B

Explanation:

Thin fur is better for warmer weather, so the rabbits with thinner fur won't over heat in the warming weather.

The population of rabbits n the genetic ecosystem has thick fur and others have thin fur, due to the changes in the climate avg temperature of the ecosystem is steadily falling.

Hence the option A is correct.

Learn more about thein an ecosystem has a genetic variation

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Answer:

Transport oxygen.

Explanation:

Red blood cells transport oxygen throughout the body with the help of hemoglobin.

Answer:

2, 23 pairs

Explanation:

it is honestly the only one that makes sense

Answer:

yes

Explanation:

I just know the answer

Answer:

Density = Mass/Volume

Density = 216cm3/64g

Density = 3.375 g/cm3

Let me know if this helps!

Answer:

plasma membrane

Explanation:

An ostrich egg is the largest egg of any living bird. The eggshell of an ostrich egg is shinny, glossy and is cream in color. It is more oval than the egg of a chicken.

The structure of a cell comprises of the components with their specific functions which is essential to carry out the various processes of life. In an eukaryotic cell, the outer lining is known as the plasma membrane. It helps to protects the cell and separates it from the surroundings environment.

The plasma membrane is made up of proteins as well as lipids and other fat like molecules.

Explanation: C.) DNA polymerase

Answer:

Deforestation

Explanation:

I took this quiz and got a 100.

Answer:

can you answer my most recent question please

Explanation:

Natural selection refers to the procedure where the species better amended to their surrounding appear to survive and generate more offspring. Natural selection refers to one of the mechanisms that make modifications in the frequencies of genes in populations and thus, it is the mechanism of evolutionary change.

However, the phenomenon of genetic drift and natural selection cannot take place unless and until there is a genetic variation, that is unless some individuals are genetically distinct from others.

Answer:

Over time, plants had to evolve from living in water to living on land. In early plants, a waxy layer called a cuticle evolved to help seal water in the plant and prevent water loss. ... To allow the plant to retain water and exchange gases, small pores (holes) in the leaves called stomata also evolved (Figure below)

Explanation:

1 DNA evidence suggests that the first eukaryotes (green plants) evolved from prokaryotes (through endosymbiotic events) between 2500 and 1000 million years ago. ... Cyanobacteria have a close evolutionary relationship with eukaryotes. They have the same photosynthetic pigments as the chloroplasts of algae and land plants.

2Plants adapt their growth, including key steps in their life cycle such as germination and flowering, to take advantage of environmental conditions. ... All land plants evolved from an aquatic ancestor, and it was after colonisation of the land that the gibberellin mechanism evolved.

3 700 million years ago

The researchers found that land plants had evolved on Earth by about 700 million years ago and land fungi by about 1,300 million years ago — much earlier than previous estimates of around 480 million years ago, which were based on the earliest fossils of those organisms.

4 The earliest trees were tree ferns, horsetails and lycophytes, which grew in forests in the Carboniferous period. The first tree may have been Wattieza, fossils of which have been found in New York State in 2007 dating back to the Middle Devonian (about 385 million years ago).

5 Plants adapt to their environment from necessity. Plants may also adapt by growing lower and closer to the ground to shield themselves from wind and cold. Desert environments may have some of the following adaptations, these help the plant to conserve food, energy and water and still be able to reproduce effectively.

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Answer:

1. While Biology is the study of living things, living things themselves are made up of chemical composition. Our survival is dependant on the reactions taking place inside and outside the body. Hence, to understand living things, biologists needs a good understanding of chemistry.

2. 170 pm is the radius of a Carbon Atom.

3. The vast majority of the mass of an atom is concentrated in its nucleus

4. Protons are found in the nucleus of the atom. This is a tiny, dense region at the center of the atom. Protons have a positive electrical charge of one (+1) and a mass of 1 atomic mass unit (amu), which is about 1.67×10−27 kilograms.

5. Neutrons are located with protons in the nucleus; they too exchange mesons with protons and with each other to form the strong nuclear force, but they do not have to overcome the repulsion from Coulomb forces since neutrons are not charged.

Answer:

what's the question? It is not showing anything expect for "How are the three International conflicts similar and how are they different."

Answer:

B, because the relationship between an mRNA codon and its corresponding amino acid is called the genetic code. The three-nucleotide code means that there is a total of 64 possible combinations (4 3, with four different nucleotides possible at each of the three different positions within the codon)

Explanation:

Hope this helps

Answer: b I think

Explanation:

Answer:

The correct answer is - Peristalsis

Explanation:

Boluses of the food move through involuntary movements of circular and longitudinal muscles known as Peristalsis is, mainly in the digestive tract or alimentary canal. These movements are likes waves or contraction in the alimentary canal.

In the oesophagus, the movement of this series of movements known as peristalsis starts from the top portion of the tube and pushes the food and pushed it into the stomach. 

Answer:

Strongest acid is hydrochloric acid

Weakest acid is rainwater

Strongest base is sodium hydroxide

Explanation:

pH is defined as the measure of hydrogen ion concentration in a particular solution. pH values seen between 0 and 1 are actually known to be strongest acids. Weakest acids are the ones that move towards neutrality. The neutral pH value is 7.0.

Looking at their pH values, we will discover that hydrochloric acid is the strongest acid. Rainwater is weakest acid because it moves towards neutrality. Sodium hydroxide is the strongest base.

In pH, values between 0-6 are referred to being acidic, 7 is neutral and while 8-14 are basic.

Answer:b

Explanation:

Answer:

first one is false

Explanation:

Answer:

suck toess

Explanation:

ttrr

Answer:

I hope this helps just to let you know this is what I searched just being honest :)

Explanation:

DNA

But your genes also mean that you probably look a bit like other members of your family. For example, have you been told that you have 'your mother's eyes' or 'your grandmother's nose'?

Genes influence what we look like on the outside and how we work on the inside. They contain the information our bodies need to make chemicals called proteins. Proteins form the structure of our bodies, as well playing an important role in the processes that keep us alive.

Genes are made of a chemical called DNA, which is short for 'deoxyribonucleic acid'. The DNA molecule is a double helix: that is, two long, thin strands twisted around each other like a spiral staircase.

27 DNA.gif

The DNA double helix showing base pairs

The sides are sugar and phosphate molecules. The rungs are pairs of chemicals called 'nitrogenous bases', or 'bases' for short.

There are four types of base: adenine (A), thymine (T), guanine (G) and cytosine (C). These bases link in a very specific way: A always pairs with T, and C always pairs with G.

The DNA molecule has two important properties.

It can make copies of itself. If you pull the two strands apart, each can be used to make the other one (and a new DNA molecule).

It can carry information. The order of the bases along a strand is a code - a code for making proteins.

Genes

A gene is a length of DNA that codes for a specific protein. So, for example, one gene will code for the protein insulin, which is important role in helping your body to control the amount of sugar in your blood.

Genes are the basic unit of genetics. Human beings have 20,000 to 25,000 genes. These genes account for only about 3 per cent of our DNA. The function of the remaining 97 per cent is still not clear, although scientists think it may have something to do with controlling the genes.

Chromosomes

If you took the DNA from all the cells in your body and lined it up, end to end, it would form a strand 6000 million miles long (but very, very thin)! To store this important material, DNA molecules are tightly packed around proteins called histones to make structures called chromosomes.

105-Gene-unwrapped.gif

The packaging of DNA into chromosomes

Human beings have 23 pairs of chromosomes in every cell, which makes 46 chromosomes in total. A photograph of a person's chromosomes, arranged according to size, is called a karyotype.

The sex chromosomes determine whether you are a boy (XY) or a girl (XX). The other chromosomes are called autosomes.

106-autosomes.gif

The karyotype of a male human being

The largest chromosome, chromosome 1, contains about 8000 genes. The smallest chromosome, chromosome 21, contains about 300 genes. (Chromosome 22 should be the smallest, but the scientists made a mistake when they first numbered them!).

The DNA that contains your genes is stored in your cells in a structure called the nucleus.

Answer:

The three laws of inheritance proposed by Mendel include: Law of Dominance. Law of Segregation. Law of Independent Assortment.

Explanation:

Answer:

20.5%

Explanation:

Hope this helps!!

Answer:

Amino acids

Explanation:

Answer:

AMINO ACIDS

Explanation:

AMINO ACIDS ARE THE MONOMERS OF PROTEINS