Photorespiration occurs because:
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there is more O2 than CO2 in the atmosphere.
Where is the photosynthetic electron transport chain located in plant cells?
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in the thylakoid membranes of the chloroplast
What would happen to a cell if cyclin was always present in the cell?
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- The cell would divide rapidly.
- Cyclin-dependent kinases would be always activated.
- The cell cycle would not stop at checkpoints.
- Cell cycle proteins would be always phosphorylated.
Which of these events does NOT include a checkpoint in the cell cycle?
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- the transition from G2 to M phase
- the beginning of M phase
- the transition from G1 to S phase
How does an "activated" receptor transfer information into the cell?
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through a conformational change of the receptor
In the context of cell signaling, to what does the term ligand refer?
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, a signaling molecule
What does a ligand-gated channel do?
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It allows ions to move across the plasma membrane.
Defects in cell signaling can lead to a cancerous cell as a result of:
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- overproduction of a receptor that triggers cell division.
- overproduction of signals that trigger cell division.
- a defective signal transduction protein that stays in the activated state and
triggers cell division continuously.
- a defective receptor that stays in the activated state and triggers cell
division continuously.
What happens to CDKs in the absence of cyclins?
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They are inactive.
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there is more O2 than CO2 in the atmosphere.
Where is the photosynthetic electron transport chain located in plant cells?
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in the thylakoid membranes of the chloroplast
What would happen to a cell if cyclin was always present in the cell?
,Give this one a try later!
- The cell would divide rapidly.
- Cyclin-dependent kinases would be always activated.
- The cell cycle would not stop at checkpoints.
- Cell cycle proteins would be always phosphorylated.
Which of these events does NOT include a checkpoint in the cell cycle?
Give this one a try later!
- the transition from G2 to M phase
- the beginning of M phase
- the transition from G1 to S phase
How does an "activated" receptor transfer information into the cell?
Give this one a try later!
through a conformational change of the receptor
In the context of cell signaling, to what does the term ligand refer?
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, a signaling molecule
What does a ligand-gated channel do?
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It allows ions to move across the plasma membrane.
Defects in cell signaling can lead to a cancerous cell as a result of:
Give this one a try later!
- overproduction of a receptor that triggers cell division.
- overproduction of signals that trigger cell division.
- a defective signal transduction protein that stays in the activated state and
triggers cell division continuously.
- a defective receptor that stays in the activated state and triggers cell
division continuously.
What happens to CDKs in the absence of cyclins?
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They are inactive.
