Ques: Q: The field of organic chemistry studies the structure and reactivity of compounds containing what element? Read this paragraph and choose the correct option from the provided answers: Since then, the distinction between organic and inorganic compounds and reactions has blurred. Currently, the field of organic chemistry studies the structure and reactivity of nearly all carbon-containing compounds. Over twenty million organic compounds are known, ranging from very simple molecules to complex proteins. Choices: - nitrogen - hydrogen - oxygen - carbon A:
Ans: carbon

Ques: Q: What changes the chemical composition of a substance and can only occur through a chemical reaction? Read this paragraph and choose the correct option from the provided answers: Pure substances, such as compounds, can be separated through chemical changes. Chemical changes change the chemical composition of a substance and can only occur through a chemical reaction. Choices: - carbon changes - Oxygen Changes - mineral changes - chemical changes A:
Ans: chemical changes

Ques: Q: What helps to regulate consciousness, arousal, and sleep states? Read this paragraph and choose the correct option from the provided answers: Basal Ganglia Interconnected brain areas called the basal ganglia (or basal nuclei), shown in Figure 35.20b, play important roles in movement control and posture. Damage to the basal ganglia, as in Parkinson's disease, leads to motor impairments like a shuffling gait when walking. The basal ganglia also regulate motivation. For example, when a wasp sting led to bilateral basal ganglia damage in a 25-year-old businessman, he began to spend all his days in bed and showed no interest in anything or anybody. But when he was externally stimulatedas when someone asked to play a card game with himhe was able to function normally. Interestingly, he and other similar patients do not report feeling bored or frustrated by their state. Thalamus The thalamus (Greek for "inner chamber"), illustrated in Figure 35.24, acts as a gateway to and from the cortex. It receives sensory and motor inputs from the body and also receives feedback from the cortex. This feedback mechanism can modulate conscious awareness of sensory and motor inputs depending on the attention and arousal state of the animal. The thalamus helps regulate consciousness, arousal, and sleep states. A rare genetic disorder called fatal familial insomnia causes the degeneration of thalamic neurons and glia. This disorder prevents affected patients from being able to sleep, among other symptoms, and is eventually fatal. Choices: - hypothalamus - hippocampus - cerebral cortex - thalamus A:
Ans: thalamus

Ques: Q: A globe is the best way to make a map of what? Read this paragraph and choose the correct option from the provided answers: Earth is a sphere and so is a globe. A globe is the best way to make a map of the whole Earth. Because both the planet and a globe have curved surfaces, the sizes and shapes of countries are not distorted. Distances are true to scale. ( Figure below ). Choices: - a continent - solar system - a city - whole earth A:
Ans:
whole earth