Answer:
Algae are classified based on the
1. type of chlorophyll and secondary pigments
2. method of food storage
3. composition of cell wall
Explanation:
Algae can be classified on the basis of chlorophyll or other secondary pigments. For example, green algae have chlorophyll a and b. Brown algae possess chlorophyll a, c, carotenoids and xanthophyll pigments. Red algae possess a red pigment called r-phycoerythrin.
Other characteristics on which algae can be classified are their mode for storing food and the composition of the cell wall.
D. All 3..................................
The correct answer to this is:
“Adequate Intake (AI)”
Adequate Intake is a recommended average
daily nutrient intake level, based on approximations of intake which appear to sustain
an adequate nutritional condition in a group of healthy people.
<span>AI’s are expected to proceed the percentage
of RDAs (97-98%).</span>
Answer:
C. It is reduced at the end of the electron transport chain, forming water.
Explanation:
Oxygen is the <u>ultimate acceptor of electron </u>during respiration. It accepts the electron which flows through various complexes of the electron transport chain (ETC) and in the end gets reduced to produce water molecule (H₂O). In the absence of oxygen, aerobic respiration cannot occur because the lack of oxygen will lead to the inhibition of the Krebs cycle. It happens because Krebs cycle needs NAD⁺ and in the absence of oxygen, ETC will not operate so NAD⁺ will not be produced. Thus even if oxygen is not required by Krebs cycle directly, indirectly it is essential for Krebs cycle to operate.
In view of above, we can infer that oxygen is essential for aerobic respiration to occur and in the absence of oxygen only anaerobic respiration which produces less ATP can take place.
