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alukav5142 [94]
4 years ago
11

A strong covalent bond between adjacent nucleotides is: a) a van der Waals bond. b) an ionic bond. c) a phosphate bond. d) a hyd

rogen bond. e) a phosphodiester bond.
Biology
1 answer:
zhuklara [117]4 years ago
8 0

Answer:

The correct answer will be option-E

Explanation:

The structure of DNA revealed by Watson and Crick showed that Two strands of DNA are present in the intertwined state forming helix representing DNA as a double helix.

Each strand of DNA is made up of the monomer unit of DNA called nucleotide where each nucleotide binds to another nucleotide through weak covalent bond called phosphodiester bond.

The phosphodiester bond is formed between the 3’-OH group of one nucleotide to 5’ phosphate group of another nucleotide. In this way, the phosphate-sugar molecule forms the backbone of the DNA molecule.

Thus, option-E is the correct answer

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Answer:

A sensory neuron.

Explanation:

The nervous system can be divided in two systems: the central nervous system and the peripheral nervous system. The central nervous system (CNS) is composed by the brain and the spinal cord. The peripheral nervous system (PNS) consists of the nerves and ganglia. Neurons are specialized cells that form the basic functional unit of the nervous system. There are three types of neurons: sensory, motor and interneurons. The sensory neurons are in charge of bringing signals into the CNS, and the motor neurons are in charge of carrying signals out of the CNS. The interneurons act as intermediaries, passing information between two neurons.  

As the name implies, sensory neurons are activated by the senses, for example: sound, visible light, physical contact (heat and cold), chemical signals (smell and taste). The loss of sensation in one hand would be the result of a damaged sensory neuron.  

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3 years ago
In a classic experiment using pea shape, Mendel conducted two separate genetic crosses. In the first cross the parent plants wer
Kamila [148]

The question is incomplete. The rest of the question is :

From these experiments, Mendel developed four hypotheses. They include all but ___________. A. One heritable factor may be dominant and mask the other factor. B. Any organism that "shows" a heritable factor must be homozygous. Eliminate C. An organism has two "heritable factors", now called genes, one from each parent. D. sperm or egg carries only one heritable factor for each trait in the offspring.

Answer:

<em>The hypothesis which is excluded is B 'Any organism that "shows" a heritable factor must be homozygous.'</em>

Explanation:

The hypothesis is wrong because even heterozygous traits are heritable.

The hypothesis mentioned in option B cannot be considered correct because Mendel's studies showed that all traits can be inherited from the parents. All factors whether dominant or recessive, homozygous or heterozygous are heritable characteristics. Mendel's study also confirmed that genes might carry homozygous or heterozygous alleles and these alleles independently assort into gametes and are heritable.

All other hypotheses are correct and their authenticity was validated after Mendel performed his experiments.

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Answer:

Option (4) weakening bonds in reactants

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