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Dark reactions occur within the thylakoid membranes?
It's a true and false question, the answer is: False
Are thylakoid membranes the site of the light reactions?
Yes, thylakoid membranes are the site of the light reactions in photosynthesis. Light energy is absorbed by chlorophyll and other pigments in the thylakoid membranes, leading to the production of ATP and NADPH, which are used in the Calvin cycle to produce sugars.
True or false an electron transport chain connects photosystem 1 and photosystem2?
False. The electron transport chain connects the two photosystems in the thylakoid membrane, but it does not directly connect photosystem 1 and photosystem 2. Instead, it shuttles electrons between the two photosystems as part of the light-dependent reactions of photosynthesis.
Are membranes selectively permeable if they allow only certain substances to move across them?
False.
Is a eukaryotic cell has organelles surrounded by membranes true or false?
true
In reactions betewwen gases all collisions lead to reactions?
The statement is false as a generalization.
Is the following sentence true or false Both chloroplasts and mitochondria are enclosed by two envelope membranes?
True. Both chloroplasts and mitochondria have a double-membrane envelope that surrounds their organelle structures.
Can blood borne pathogens enter your body through the mucus membranes?
false
Does the stroma separate the inner and outer membranes of the mitochondria?
No, the stroma is found in chloroplasts, not mitochondria. In mitochondria, the inner and outer membranes are separated by the intermembrane space.
True or false the reactions that convert the energy in sunlight into chemical energy of ATP and NADPH are called the Calvin cycle?
False. The reactions that convert the energy in sunlight into chemical energy of ATP and NADPH are part of the light-dependent reactions in photosynthesis. The Calvin cycle, on the other hand, is the series of reactions that occur in the stroma of chloroplasts and are responsible for carbon fixation and the production of sugars.
True or false The light reactions of photosynthesis can occur only under light conditions and the dark reactions can occur only during the dark hours?
False. The light reactions of photosynthesis require light to convert solar energy into chemical energy, while the dark reactions (Calvin cycle) do not directly rely on light and can occur in both light and dark conditions. However, the dark reactions are indirectly dependent on the products of the light reactions.
Thyroxine molecules are too large to pass through the plasma membranes of their target cells?
false- small
