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3 years ago

Why was it important for Miller and Urey to sterilized the apparatus to kill any bacteria in it?

Biology

1 answer:

valentina_108 [34]3 years ago

3 0

Answer:

Having bacteria would produce organic molecules and defeat the whole purpose of the experiment which is to make organic molecules from inorganic molecules. The experiment was supposed to demonstrate the formation of the first organic molecules that initiated life on primordial earth. It is believed that lightning powered the formation of the first simple amino acids, like glycine, from the primordial atmosphere which was mainly composed of carbon dioxide and methane.

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One species has 24 chromosomes, and another species has 26 chromosomes. If these two species are crossed, how many chromosomes w

netineya [11]

Species A : 2N = 24, N = 12

Species B : 2n = 26, n = 13

During the hybridization N + n = 25

4 0

3 years ago

Match each word or phrase to identify whether or not each word or phrase represents a

Alexxandr [17]

The reason for the change in the hands of the chimpanzee include:

Crossbreeding between gorillas and chimpanzees( Represents a reason for the change)
Mutations in chimpanzee DNA ( Represents a reason for the change)
Differences in the ways chimpanzees use their hands ( Doesn't represents a reason for the change)
Sexual reproduction ( Doesn't represents a reason for the change)
Differences in enhancer sequences( Represents a reason for the change).

<h3>What is mutation?</h3>

Mutation is defined as the alteration in the genetic makeup of a living organism which may occur due to the following:

When there is spontaneous break down of deoxyribonucleic acid (DNA).
Change in a single nucleotide of the DNA.
when there is additions or deletions of nucleotide in a DNA strand.

A change can be noticed in an animal such as Chimpanzee when the following occurs:

Mutations in chimpanzee DNA: This can alter both that anatomy and the physiological features of the organism involved.

Crossbreeding between gorillas and chimpanzees: When there is cross breeding between a chimpanzee and a gorilla, it will lead to a genetic diversity which can be observed as a change in the hands of the chimpanzee.

Learn more about mutation here:

brainly.com/question/29352366

#SPJ1

4 0

1 year ago

A single layer of irregularly shaped epithelial cells found lining the respiratory tract is called

ValentinkaMS [17]

Diptheria. go see your doctor.

7 0

3 years ago

Drag the tiles to the correct boxes to complete the pairs.

cupoosta [38]

Answer:

did you already get the answer or you still need help

4 0

2 years ago

Match each leukocyte to its normal percentage in a differential cell count. A. 50-70% B. 20-40% C. 2-8% D. 1-4% E. < 1% basop

Vsevolod [243]

Answers:

A. 50-70% - neutrophils

B. 20-40% - Lymphocytes

C. 2-8% - monocytes

D. 1-4% - eosinophils

E. < 1% - basophils

Explanation:

The blood differential test is used to estimate the percentage of each class of white blood cell (WBC) present in the blood and to indicate the presence of abnormal or immature cells.

The Test is Performed by taking of blood sample which is smeared onto a glass slide, then it's stained with a unique dye to indicate the class of white blood cells.

The Five class of white blood cells are

Neutrophils

Lymphocytes (B cells and T cells)

Monocytes

Eosinophils

Basophils

The different class of white blood cells are given as a percentage:

Neutrophils: 40% to 60%

Lymphocytes: 20% to 40%

Monocytes: 2% to 8%

Eosinophils: 1% to 4%

Basophils: 0.5% to 1%

Band (young neutrophil): 0% to 3%

7 0

3 years ago