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ArbitrLikvidat [17]
2 years ago
13

A DNA molecule consists of two antiparallel strands of polynucleotides. Each strand is composed of nucleotides bound to each oth

er along the sugar-phosphate backbone.
Biology
2 answers:
andreev551 [17]2 years ago
7 0

Answer:

Explanation: The basic unit of a DNA is a Nucleotide. The nucleotide comprises of: the nitrogenous bases, a deoxyribose sugar and a phosphate group. The nitrogenous bases are the purines and pyrimidines . The include, Adenine, guanine, Thymine and cytosine

grandymaker [24]2 years ago
3 0

Answer:

True.

Explanation:

The DNa molecule is made up of two antiparallel strands and complementary to each other. That's because each strand is polynucleotide, which means it is made up of several nucleotides.

Each nucleotide is formed by a nitrogenous base, a phosphate group and a sugar. The heterogenated bases of DNA are: adenine, guanine, thymine and cytosine, and they are responsible for linking the two strands of DNA, since the adenine of one strand is able to make connections with the thymine of the other strand and guanine from one strand is capable of making connections with the cytosine of another strand.

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Which of the following represents the correct flow of air into the lung of a mammal?
7nadin3 [17]

I believe the answer would be A.

The flow is larynx, trachea, bronchi, bronchioles, alveoli

3 0
2 years ago
When Thomas Hunt Morgan crossed his red-eyed F1 generation flies to each other, the F2 generation included both red- and white-e
EastWind [94]

Answer:

Gene is present on the X chromosome.

Explanation:

The two main types of chromosomes are autosomes and sex chromosomes. Autosomes regulates the functioning of the body but do not play role in determining the sex of an individual. The sex chromosomes distinguishes between the male and female.

The linkage of sex chromosomes is present in Drosophila as well. The cross between the F1 generation leads to both the red and white eyed flies because the eye color gene is present on the X chromosome. The males contain only one X chromosome and the presence of recessive gene results in the white color whereas in females both the X chromosomes must contain recessive gene for the white color.  

Thus, the answer is gene involved is on the X chromosome.

8 0
2 years ago
Carbolfuchsin used in the original acid fast stain consisted of 0.3 g basic Fuchs in 10 ml 95% ethanol 5ml phenol and 95 ml wate
AysviL [449]
MycolicWhat are the components of acid alcohol?Prevent contamination of the smear by the stain pptWhat is the purpose of placing a filter paper on the glass slide?<span>1. Flood with carbolfuchsin. Heat until steam is given off for about 5 min
2. Allow to stand for more 5 min w/o heating. Remove the filter paper
3. Decolorize with acid alcohol while continously agitating the slide, then wash with water
4. Counterstain with methylen blue for 30 sec., wash with water then let it dry</span>Discuss the procedure in using ziehl-neelsen methodRedWhat is the color of an acid fast bacteria?Blue/greenWhat is the color of non-acid fast bacteria?<span>4g basic fuchsin
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8 ml phenol
100 ml distilled water</span>What are the components of kinyoun's carbolfuchsin?<span>1. Flood the smear with kinyoun's for about 5.min 
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3. Decolorize to faint pink color with acid alcohol for 3 min
4. Rinse again with deionized water
5. Flood with methylene blue for (4min), dry and examine under OIO</span>Discuss the procedure in using kinyoun's methodHorizontal or vertical scanningWhat is the proper way or direction of reading your stained smear?Horizontal scanningWhat is known as standard scanning?Pappenheims methodIn what method we use rosalic acid and alcohol as decolorizer?ColorlessWhat is the reaction of Mycobacterium smegmantis when rosalic acid and alcohol was added as decolorizer in pappenheims method?Diluted alcholic fuchsinWhat is use as stain i youe baumgarten's method?Red
8 0
2 years ago
Read 2 more answers
The types of cells found in the parathyroid gland are the parathyroid cells (productive glandular cells) and the oxyphil cells.
IRINA_888 [86]

Answer:

false

Explanation:

The parathyroid gland refers to the four small endocrine glands located in the neck region behind the thyroid. It secretes the parathyroid hormone or parathormone which regulates the calcium levels in our bodies. It comprises two types of cells which are:

a. The oxyphil cells appear at the onset of puberty and they have no known functions. They appear pink or orange when stained with hematoxylin and eosin stain.

b. The chief cells are more abundant compared to the oxyphil cells and stain dark purple by the action of hematoxylin and eosin stain. Their major function is to produce parathyroid hormone which regulates the amount of calcium in the body.

5 0
2 years ago
Amylase is an enzyme that converts carbohydrate polymers into monomers. Glycogen synthase is one of the enzymes involved in conv
ollegr [7]

Answer:

This question is incomplete; the complete part is:

Which of the following best explains the reactions of these enzymes?

A) Amylase aids in the removal of a water molecule to break covalent bonds whereas glycogen synthase aids in the addition of a water molecule to form covalent bonds.

B) Amylase aids in the addition of a water molecule to break covalent bonds whereas glycogen synthase aids in the removal of a water molecule to form covalent bonds.

C) Amylase aids in the addition of a water molecule to form covalent bonds whereas glycogen synthase aids in the removal of a water molecule to break covalent bonds.

D) Amylase aids in the removal of a water molecule to form covalent bonds whereas glycogen synthase aids in the addition of a water molecule to break covalent bonds.

The answer is A

Explanation:

In nature, MONOMERS are simpler units that come together to form larger units called POLYMERS. According to this question, Amylase converts carbohydrate polymers to monomers while Glycogen synthase converts carbohydrate monomers to polymers.

Monomers of carbohydrate are joined together by adding water molecule to form covalent bonds between the monomer units, hence, forming a POLYMER. This is how Glycogen synthase catalyzes its reaction of forming carbohydrate polymer (glycogen).

On the other hand, Amylase breaks down large polymer molecules into monomers by removing water molecules in a process called HYDROLYSIS. This breaks the covalent bond that holds the monomeric units together.

3 0
2 years ago
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