Answer:
The backbone of the double helix is made up of SUGAR molecules and PHOSPHATE groups, and the two chains are joined together by hydrogen bonds between the NUCLEOTIDE BASES
Explanation:
DNA is a double helix structure. It looks similar to a twisted ladder. The backbone is like the sides of the ladder. They are made up of sugar molecules called deoxyribose and phosphate linked together. The nucleotide bases make up the rungs. Each rung is made up of 2 complimentary bases that are held together by hydrogen bonds.
The backbone of the double helix is made of sugar-phosphate molecules and groups. The two chains are joined by hydrogen bonds between the nitrogenous bases. These bases are adenine (A), thymine (T), cytosine (C), and guanine (G)
The backbone of the double helix, such as DNA, is made up of sugar-phosphate molecules and sugar-phosphate groups, and the two chains are joined together by hydrogen bonds between the nitrogenous bases
More specifically, the sugar is deoxyribose, and the phosphate group is a component of each nucleotide. The strands of the helix run in opposite directions, making them antiparallel. The nitrogenous bases that join the two strands are adenine, thymine, cytosine, and guanine - adenine always binds with thymine and cytosine with guanine.
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B. Hormones provide feedback that affects neural processing.
C. Sensory receptors in bones send signals about body position to the brain.
D. The brain sends signals that control the speed at which food moves through the intestines.
Answer:
B
Explanation: The endocrine system secretes hormones into blood and other body fluids. Hormones provide feedback to the brain to affect neural processing. Reproductive hormones affect the development of the nervous system. The hypothalamus controls the pituitary gland and other endocrine glands.
A single molecule has at least 2 atoms.
For example, the oxygen we breathe has only 2 molecules.
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Answer:
The correct answer would be the organismal theory.
The three main principles of the cell theory are:
The organismal theory was developed as a counter argument towards the cell theory.
One of the principles of this theory states that "cells are the basic building blocks of life but don't constitute life itself". For example, cells removed from a multicellular organism require specific life support systems in order to keep them alive.