AP BIOLOGY

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BIOCHEMISTRY

ENZYMES AND METABOLISM

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A scientist studying photosynthesis places a plant in a environment where all of the carbon dioxide contains the radioactive isotope 18O. She can then use the radiation from that isotope to determine where those oxygen atoms from the carbon dioxide ended up after photosynthesis. Predict which products contains the 18O isotope.I. Water II. Glucose III. Oxygen IV. ATP
A
I only
B
III only
C
I and II
D
II and IV
Explanation: 

Detailed explanation-1: -Photosynthesis requires sunlight, carbon dioxide, and water as starting reactants (Figure 5.5). After the process is complete, photosynthesis releases oxygen and produces carbohydrate molecules, most commonly glucose. These sugar molecules contain the energy that living things need to survive.

Detailed explanation-2: -During the process of photosynthesis, cells use carbon dioxide and energy from the Sun to make sugar molecules and oxygen.

Detailed explanation-3: -In photosynthesis, solar energy is harvested as chemical energy in a process that converts water and carbon dioxide to glucose. Oxygen is released as a byproduct. In cellular respiration, oxygen is used to break down glucose, releasing chemical energy and heat in the process.

Detailed explanation-4: -Oxygen (O2) is evolved during photosynthetic electron transport when water is split by the oxygen-evolving complex to provide protons and electrons to the chloroplastic electron chain, thereby generating ATP and NADPH-the energy source and reducing power for plant metabolism.

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