Regents Life Science General Review

What is the primary function of specialized cells within organisms?

• To store genetic information in the form of DNA

• To perform essential functions of life

• To convert light energy into chemical energy

• To maintain feedback mechanisms

Answer explanation

Specialized cells are designed to perform essential functions of life, such as metabolism, growth, and reproduction, which are crucial for the survival and proper functioning of organisms.

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What do genes in DNA contain instructions for?

• Formation of carbohydrates

• Formation of proteins

• Formation of lipids

• Formation of vitamins

Answer explanation

Genes in DNA contain instructions for the formation of proteins, which are essential for various functions in living organisms. The other options, such as carbohydrates, lipids, and vitamins, are not directly encoded by genes.

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How do feedback mechanisms help living systems maintain internal conditions?

• By converting carbon dioxide into sugars

• By mediating behaviors and encouraging or discouraging processes

• By storing genetic information

• By forming hierarchical structural organizations

Answer explanation

Feedback mechanisms help living systems maintain internal conditions by mediating behaviors and encouraging or discouraging processes, ensuring stability and homeostasis.

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What is the failure of homeostasis referred to as?

• Photosynthesis

• Disease

• Protein synthesis

• Genetic mutation

Answer explanation

The failure of homeostasis, which is the body's ability to maintain stable internal conditions, is referred to as disease. This term encompasses various health issues that arise when homeostatic balance is disrupted.

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What does the process of photosynthesis convert light energy into?

• Stored chemical energy

• Genetic information

• Proteins

• Feedback mechanisms

Answer explanation

The process of photosynthesis converts light energy into stored chemical energy in the form of glucose, which plants use for growth and energy.

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What happens to energy as chemical elements are recombined in living systems?

• Energy is destroyed during chemical reactions.

• Energy is transferred from one system of interacting molecules to another.

• Energy is stored permanently in molecules.

• Energy is lost completely during recombination.

Answer explanation

In living systems, energy is not destroyed or lost; instead, it is transferred between interacting molecules during chemical reactions, facilitating processes like metabolism and energy production.

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What elements are found in sugar molecules that combine to form larger molecules like proteins or DNA?

• Carbon, hydrogen, and oxygen.

• Nitrogen, phosphorus, and sulfur.

• Sodium, potassium, and calcium.

• Iron, magnesium, and zinc.

Answer explanation

Sugar molecules are primarily composed of carbon, hydrogen, and oxygen. These elements are essential for forming larger biological molecules like proteins and DNA, which also contain nitrogen and phosphorus.

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What is the primary product of cellular respiration that is used to carry out life processes?

• Glucose.

• ATP.

• Oxygen.

• Carbon dioxide.

Answer explanation

The primary product of cellular respiration is ATP (adenosine triphosphate), which provides the energy necessary for various life processes. Glucose is a reactant, while oxygen and carbon dioxide are byproducts.

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Which processes provide most of the energy for life functions in ecosystems?

• Photosynthesis and cellular respiration.

• Fermentation and decomposition.

• Evaporation and condensation.

• Digestion and excretion.

Answer explanation

Photosynthesis converts solar energy into chemical energy in plants, while cellular respiration releases that energy for use by organisms. Together, they are fundamental processes that power life functions in ecosystems.

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Why are there generally fewer organisms at higher levels of a food web?

• Energy is lost as heat at each level.

• Matter is destroyed at higher levels.

• Organisms at higher levels consume less matter.

• Energy and matter are conserved at lower levels only.

Answer explanation

Energy is lost as heat at each level of the food web, leading to fewer organisms at higher levels. This loss limits the amount of energy available to support large populations of predators.

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