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Vikki [24]
3 years ago
7

A scientist performed an experiment on mice. Her results are posted below. Lung Cancer in Mice Experiment Group Duration of Ciga

rette Smoke Exposure Number of Cases of Lung Cancer 1 0 days 0 2 500 days 3 3 1,000 days 27 4 1,500 days 32 After analyzing her results, she stated that a mouse must be exposed to more than 500 days of cigarette smoke before the mouse can get lung cancer. Do you agree with the scientist's conclusions?
Biology
2 answers:
DiKsa [7]3 years ago
6 0

Answer:

Scientist's conclusion might be wrong and needs to be probed further with experiments

Explanation:

In the experiment the mice was observed first at day 0 and then directly at day 500. When the scientist found 3 mice suffering from lung cancer at day 500 she gave the conclusion that the mice need to be exposed for 500 or more days for developing lung cancer. But there is a huge duration gap of 500 days between her first and second experimental group. The mice could have developed cancer anywhere between 0 and 500 days so now she needs to break this duration into smaller gaps and repeat the experiment to narrow down the result. She needs to expose the mice to smoke at varying duration between 0 and 500 days. After she gets a result in this second experiment, she needs to further narrow down the gap till she arrives at a definite conclusion.

DENIUS [597]3 years ago
4 0

No; some mice may have developed lung cancer in less than 500 days of cigarette smoke exposure.

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Determine whether each statement describes mitosis, meiosis, or both mitosis and meiosis.
svp [43]

Occurs in  organisms that  sexually reproduce ==> Occurs in meosis.

Meiosis is a type of gamete-specific nuclear division.

Meiosis occurs during spermatogenesis and oogenesis (egg formation in women).

In order for the number of chromosomes, characteristic of the species, to be conserved, it is necessary that before the encounter, the number of chromosomes of each of the reproductive cells be divided by two.

The reduction in the number of chromosomes takes place during the phenomenon called "meiosis".


Occurs during  growth and  development ==> It concerns mitosis.

Mitosis will ensure the good fulfillment of several phenomena:

. embryonic development,

. the general growth of organisms from birth to adult size,

. continued growth of certain organisms and / or organs; for example, trees, hair, teeth in ruminants, nails, ...


The DNA is  replicated ==> concern both mitosis and meiosis.

The cell cycle of eukaryotic cells is as follows:

• Interphase (normal functions, DNA replication)

G1 - growth / cellular activity

S - DNA synthesis / replication

G2 - preparation for division

• Phase M (cell division): which consists of either mitosis or meiosis, depending on cell types.

• Cytocinesis (cytoplasmic division).

So whether it is mitosis or meiosis, both are preceded by a replication of the genetic material (DNA)


Occurs in  all organisms ==> concern both mitosis and meiosis.

An organism is a set of elements that make up a functional structure.

In biology, the term organism designates a living being as it is organized, that is to say composed of different organs or organelles forming a coherent whole (as opposed to micro-organisms).

All multicellular organisms have sexual reproduction, so their cells are systematically mitosis and meiosis.

We exclude microorganisms of which a very small part of them have asexual reproduction.


The number of  chromosomes  remains the same : concerns only mitosis.

During mitosis, the human cell has 2n monochromatid chromosomes. In phase S consists of a doubling of the amount of DNA indeed, and the cells then have 2n chromosomes bichromatidiens. In the metaphase of mitosis, the chromosomes of the mother cell are arranged on a "metaphase plate", then split in 2-chromosomes, but monochromatids, during anaphase. Each daughter cell therefore has 2n monochromatid chromosomes.



The number of  chromosomes  reduces by half ==> Concerns only meiosis

Meiosis unfolds in two stages:

* The first meiotic division is called reductional because it allows to pass from 2n double chromosomes to n double chromosomes.

* The second is called equational because it preserves the number of chromosomes: one passes from n double chromosomes to n simple chromosomes.

Meiosis thus allows the formation of 4 haploid daughter cells (or gametes).

In humans, a normal cell contains 2n = 46 chromosomes (thus 23 pairs) while a gamete contains n = 23 chromosomes in two divisions).

3 0
3 years ago
Read 2 more answers
What is endoplasmic reticulum and it's types​
solong [7]

The endoplasmic reticulum is, in essence, the transportation system of the eukaryotic cell, and has many other important functions such as protein folding. It is a type of organelle made up of two subunits – rough endoplasmic reticulum, and smooth endoplasmic reticulum. It usally has ribosomes attatched to it.

5 0
3 years ago
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One of the primary functions of RNA molecules is to _____. One of the primary functions of RNA molecules is to _____. act as a p
nadya68 [22]

Answer: function in the synthesis of proteins

Explanation:

Ribonucleic acid or RNA is a kind of essential nucleic acid present in the cells of the living beings. The main function of the RNA is to carry the information present in the coded form in amino acid sequence obtain from the genes to produce protein molecules. The amino acid sequence gets assembled on the ribosome brought about by the messenger RNA (mRNA) each amino acid sequence encodes for a typical protein molecule. A single strand of DNA acts as a blueprint for the synthesis of mRNA which is transcribed from the strand of DNA.

7 0
3 years ago
Which of the following is on the anterior side of the hand and wrist?
nirvana33 [79]

Answer:

it's d. Flexor carpi radialis

Explanation:

The other three are on the Posterior side. Extensor carpi ulnas should also be spelled ( Extensor carpi ulnaRIs )

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Proteins are important food nutrients. A technician working at a food company is interested in the nutritional content of seeds/
Vladimir79 [104]

Answer: Sample 1 then, has more variety of proteins but less quantity of each one, while sample 2 has less variety but more quantity of the two proteins present.

Explanation:

Proteins are molecules found in the cells of all living organisms. A protein is composed of monomers called amino acids linked together by peptide bonds. To analyze proteins, a technique called SDS-PAGE (sodium dodecyl sulfate polyacrylamide gel electrophoresis) is used. <u>This technique is used to separate proteins according to their electrophoretic mobility, depending on polypeptide chain length, molecular mass, post-translational modifications and other factors</u>. SDS (sodium dodecylsulfate) is an anionic surfactant compound that breaks non-covalent bonds in proteins, denatures them causing these protein molecules to lose their native conformation and provides the polypeptide with a negative charge that is proportional to the chain length (the number of amino acids) and, therefore, to the molecular mass of the protein. The electrostatic repulsion created by the binding of SDS to the protein is one of the causes of the protein losing its native conformation, thus eliminating the differences in conformation of the different proteins to be separated in the gel.

An electric current is applied to the gel where the proteins are seeded, causing the negatively charged proteins to migrate through the gel in the direction of the anode (positively charged region). Short proteins will move more easily and faster through the pores of the gel, while larger proteins will find it more difficult to do so. After a certain time, the proteins will have migrated according to their size (measured in kDa or kiloDaltons). After electrophoresis, the gel should be stained with Coomassie blue or silver stain, allowing visualization of the separated proteins. After staining, the different proteins will appear as distinct bands on the gel. In addition, the higher the amount of a protein, the more intense the color of its band will be.

Extract No. 1 shows three bands: 25, 30 and 35 kDa. <u>This means that it has three different proteins</u>, each with a different molecular weight. Extract number 2 shows two bands: 25 and 35 kDa. <u>It means that this sample has only 2 proteins. And being bands of higher intensity, we can say that there is more of each protein.</u>

Sample 1 then, has more variety of proteins but less quantity of each one, while sample 2 has less variety but more quantity of the two proteins present.

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