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Tpy6a [65]
4 years ago
9

As microscope technology improved over time, the magnification became advanced enough to discover cells in the 17th century. Thi

s discovery is largely attributed to Robert Hooke, and began the scientific study of cells, also known as cell biology. Over a century later, debate continued among scientists about how cells began. Most of these debates involved the nature of cell reproduction, and the idea of cells as a fundamental unit of life. Cell theory was eventually formulated in 1839. The three tenets to the cell theory are as described below: 1. All living organisms are composed of one or more cells. 2. The cell is the basic unit of structure and organization in organisms. 3. Cells arise from pre-existing cells. How does cell division prove the cell theory? A) Cell division demonstrates spontaneous generation. B) Cell division demonstrates that cells come from preexisting cells. C) Cell division demonstrates that all living organisms are composed of one or more cells. D) Cell division demonstrates that the cell is the basic unit of structure and organization in organisms.
Biology
2 answers:
spayn [35]4 years ago
8 0

Answer B) Cell division demonstrates that cells come from pre existing cells.

Feliz [49]4 years ago
5 0

Answer:

The correct answer will be option-B.

Explanation:

Cell division is the process which divides a parent cell to daughter cells through sequential steps as a part of the cell cycle. The cell division takes place in two phases: Karyokinesis- the division of nuclear material and the cytokinesis- the division of the cytoplasm.

The cell division proves one aspect of the cell theory proposed by Rudolf Virchow that is cells arises from the pre-existing cells as the pre-existing cell divides to form the daughter cells through cell division.

Thus, Option-B is the correct answer.

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Use the Harris-Benedict equation to estimate your calorie needs. Show your calculations to explain how you arrived at your answe
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Answer:

The Harris Benedict Equation is a formula that determines the total daily energy expenditure (calories) using BMR with some activity factors.

Basal Metabolic Rate (BMR) is defined as the amount of calories one would burn without doing anything for 24 hours. It uses variables of weight, age, height and gender to calculate BMR.

<em>BMR calculation =  447.593 + (9.247 x weight in kg) + (3.098 x height in cm) - (4.330 x age in years)</em>

<em>In</em><em> </em><em>Harris Benedict Equation, </em><u><em>BMR</em></u><em> is </em><u><em>multiplied</em></u><em> by </em><u><em>activity factor </em></u><em>to determine calories need.</em>

The activity factors in Harris Benedict Equation are:

for no exercise =  1.2

exercise for 1 to 3 days/week or light exercise =  1.375

exercise for 3-5 days/week or moderate exercise  = 1.55

exercise for 6-7 days a week or hard exercise = 1.725

exercise for 2 times training = 1.9

<u>So, calculation for my calorie needs is as following:</u>

BMR = 447.593 + (9.247 x 50 kg) + (3.098 x 164.592 cm) - (4.330 x 23 in years) = 974.945

Calorie needs = BMR x 1.55

                        = 974.945 x 1.55

                        = 1511.16 calories

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4 years ago
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What 2 things do cells need in order to create energy
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