Q: Q: Which theory describes the distribution of electrons in molecules in much the same way that the distribution of electrons in atoms is described using atomic orbitals? Read this paragraph and choose the correct option from the provided answers: Molecular orbital theory describes the distribution of electrons in molecules in much the same way that the distribution of electrons in atoms is described using atomic orbitals. Using quantum mechanics, the behavior of an electron in a molecule is still described by a wave function, , analogous to the behavior in an atom. Just like electrons around isolated atoms, electrons around atoms in molecules are limited to discrete (quantized) energies. The region of space in which a valence electron in a molecule is likely to be found is called a molecular orbital (2). Like an atomic orbital, a molecular orbital is full when it contains two electrons with opposite spin. We will consider the molecular orbitals in molecules composed of two identical atoms (H2 or Cl2, for example). Such molecules are called homonuclear diatomic molecules. In these diatomic molecules, several types of molecular orbitals occur. The mathematical process of combining atomic orbitals to generate molecular orbitals is called the linear combination of atomic orbitals (LCAO). The wave function describes the wavelike properties of an electron. Molecular orbitals are combinations of atomic orbital wave functions. Combining waves can lead to constructive interference, in which peaks line up with peaks, or destructive interference, in which peaks line up with troughs. Choices: - molecular distribution theory - atomic orbital theory - atomic distribution theory - molecular orbital theory A:
A: molecular orbital theory

Q: Q: What is the name of the muscle at the end of the esophagus? Read this paragraph and choose the correct option from the provided answers: From the pharynx, the food moves into the esophagus. The esophagus is a long, narrow tube that passes food from the pharynx to the stomach by peristalsis. The esophagus has no other digestive functions. At the end of the esophagus, a muscle called a sphincter controls the entrance to the stomach. The sphincter opens to let food into the stomach and then closes again to prevent food from passing back into the esophagus. Choices: - neck - intestine - throat - sphincter A:
A: sphincter

Q: Q: What is a thin layer of gas that surrounds earth called? Read this paragraph and choose the correct option from the provided answers: The atmosphere is a thin layer of gas that surrounds Earth. Climatologists study the atmosphere. These scientists work to understand the climate as it is now. They also study how climate will change in response to global warming. Choices: - the cloud cover - the dioxide - the wind cycle - the atmosphere A:
A: the atmosphere

Q: Q: The process in which dna is copied is called what? Read this paragraph and choose the correct option from the provided answers: The process in which DNA is copied is called DNA replication . You can see how it happens in Figure below . An enzyme breaks the bonds between the two DNA strands. Another enzyme pairs new, complementary nucleotides with those in the original chains. Two daughter DNA molecules form. Each contains one new chain and one original chain. Choices: - dna transfer - dna duplication - dna splicing - dna replication A:
A: dna replication