Under the microscope, a cell shows formation of centrosomes and spindle microtubules.

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Answer 1
Answer: Under the microscope, a cell shows the formation of centrosomes and spindle microtubules. After that would be the separation of the sister chromatids. The sister chromatids are the halves of replica or duplication of the chromosomes.

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A frog belongs to which kingdom?
Which characteristic defines all dichotomous keys?Each key is a series of statements.Each key is organized as a table.Each key is organized as a flowchart.Each key is a mathematical formula.
Finding a high place to wait is a safety measure during aa. thunderstorm. c. hurricane. b. tornado. d. flash flood.
A seed only germinates when environmental conditions are good. True or False
During which stage of cellular respiration is glucose broken down into two molecules of pyruvic acid?a.)electron transport chain b.)glycolysisc.)Krebs cycled.)acetyl CoA formation

Which of the following is not a natural cause of climatic change?A.Human activity
B. Solar activity
C. Earth's tilt
D. Volcanic activity

Answers

a human activity :) hope i helped 

Jane is observing a cell under an electron microscope. She identifies an organelle having an outer and an inner membrane. She also notices that the outer membrane is smooth while the inner one is highly folded. Which organelle is Jane observing?Select one of the options below as your answer:

A) Mitochondria

B) Golgi bodies

C) Nucleus

Answers

The correct option is A.

Mitochondria is one of the organelles that are found in living cells and it is the one responsible for the production of ATP, which is the source of energy that is usable by the cells. Mitochondria is designed in such a way that, it will be able to carry out its functions efficiently. Mitochondrial has two membranes, one at the outside and the other one at the inside. While the outer membrane is smooth, the inner one is highly folded and it formed a structure called cristae. The folding of the inner membrane serves to increase the surface area inside the mitochondria.

The organelle that Jane was observing was a mitochondria. A mitochondria always has a smooth outer membrane and the inner membrane is folded. The correct answer is A.

Lack of ______ has been linked to increased risk for autoimmune diseases. zinc iron vitamin C vitamin D

Answers

Lack of vitamin D has been linked to increased risk for autoimmune diseases.
Hope that helped you.

Which of the following carbon compounds stores and transmits hereditary information?A.Carbohydrates
B.Lipids
C.proteins
D.Nucleic Acids

Answers

The Answer Is D 

Hope this helps

Final answer:

Nucleic acids are the carbon compounds that store and transmit hereditary information. Primarily DNA and RNA, they serve as the molecular 'blueprints' for the formation of proteins necessary for cellular structure and function.

Explanation:

Among the listed compounds: Carbohydrates, Lipids, Proteins, and Nucleic Acids; it is the nucleic acids that store and transmit hereditary information. Nucleic acids, such as DNA and RNA, are complex compounds that serve as the blueprints of life.

DNA (Deoxyribonucleic Acid), in particular, contains the molecular instructions for the proteins that our cells need for structure and function. RNA (Ribonucleic Acid), on the other hand, helps in transmitting these instructions from DNA to the protein-building machinery of the cell.

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Researchers are conducting a study to see if exposure to an occupational toxin leads to brain tumors. The researchers recruit 1,000 men who work at a steel factory (all of whom do not have a brain tumor in 2000) and use questionnaires as well as measuring devices to see who is exposed to the occupational toxin Airflyte. After the baseline assessment, 493 of the workers were exposed to Airflyte while the others were not. After 10 years of follow up, 308 of the workers exposed to Airflyte developed brain tumors while 77 of the men not exposed to Airflyte developed brain tumors. Set up a 2x2 table with the data given.

Answers

Answer:

Explanation:

Based on the information provided, we can set up a 2x2 table to summarize the data as follows:

| Brain Tumor | No Brain Tumor | Total

--------------------------------------------------------

Exposed to Airflyte | 308 | 185 | 493

--------------------------------------------------------

Not Exposed | 77 | 430 | 507

--------------------------------------------------------

Total | 385 | 615 | 1000

In this table, the rows represent the exposure status (exposed to Airflyte or not exposed), and the columns represent the occurrence of brain tumors (brain tumor or no brain tumor). The totals are calculated for each category.

Please note that the numbers provided in the table are based on the given data and do not reflect any statistical analysis or conclusions about the relationship between exposure to Airflyte and the development of brain tumors. Further statistical analysis, such as calculating risk ratios or conducting hypothesis tests, would be necessary to determine the strength of the association between the exposure and outcome variables.

Final answer:

A 2x2 table is set up to represent the brain tumor occurrence and non-occurrence in workers who were and were not exposed to the occupational toxin Airflyte. There were 308 cases of tumors in the exposed group and 77 in the non-exposed group. The rest did not develop tumors.

Explanation:

In conducting this study, the researchers divided the 1,000 men into two groups: those exposed to the occupational toxin Airflyte and those not exposed. By using a 2x2 table, we can clearly illustrate the results obtained after the 10-year follow up. Here's how it looks:

   With Brain Tumor Without Brain Tumor    

Exposure to Airflyte

308 493 - 308 = 185  

No Exposure to Airflyte

77 507 - 77 = 430  

This table helps to visualise the observed differences in brain tumor development among the workers who were exposed to the toxin compared to those who weren't exposed.

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Why do biologist have taxonomic systems

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It permits diverse species to be sorted out into a pecking order in view of shared qualities.