AP BIOLOGY

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LABORATORY REVIEW

CELL RESPIRATION

Question [CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
A flask containing photosynthetic green algae and a control flask containing water with no algae are both placed under a bank of lights, which are set to cycle between 12 hours of light and 12 hours of dark. The dissolved oxygen concentrations in both flasks are monitored. Predict what the relative dissolved oxygen concentrations will be in the flask with algae compared to the control flask.
A
The dissolved oxygen in the flask with algae will be higher in the light, but lower in the dark.
B
The dissolved oxygen in the flask with algae will always be lower.
C
The dissolved oxygen in the flask with algae will not be different from the control flask at any time.
D
The dissolved oxygen in the flask with algae will always be higher.
Explanation: 

Detailed explanation-1: -Algae are simple, aquatic, plant-like organisms that do not have true roots, stems and leaves. Many are single-celled so can only be seen using a microscope, while others grow in filaments or mats that are quite conspicuous. Algae have chlorophyll and can make their own food through the process of photosynthesis.

Detailed explanation-2: -So, the correct answer is ‘Cyanophycean starch resembling glycogen’.

Detailed explanation-3: -Green algae are eukaryotes while cyanobacteria are prokaryotes. Hence, green algae consist of membrane-bound organelles including the nucleus, mitochondria, Golgi apparatus, etc. while cyanobacteria do not contain them. Green algae consist of chloroplasts while cyanobacteria lack chloroplasts.

Detailed explanation-4: -Chromatophores are the pigment containing membranous structures that serve as site for photosynthesis in BGA.

There is 1 question to complete.
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