Which of the following will be affected by a compound that gets rid of ATP?

Question

BlackTom AI · Accepted Answer

We start by restating what the question is asking: Which of the following will be affected by a compound that gets rid of ATP?
Option 1: GPCR. G protein-coupled receptors themselves are activated by ligand binding and then transmit the signal via G proteins. The initial receptor activation does not require ATP directly; downstream steps often involve GTP on G proteins and various second messengers. While many downstream processes rely on ATP-dependent enzymes, the receptor's activation itself is not ATP-dependent, so the absence of ATP would not specifically prevent GPCR activation.
Option 2: Receptor tyrosine kinase. RTKs catalyze the transfer of a phosphate from ATP to tyrosine residues on themselves or substrates. This phosphorylation step is ATP-dependent, so without ATP, RTKs cannot autophosphorylate or phosphorylate their substrates, effectively blocking their signaling.
Option 3: Ligand-gated ion channel. These channels open in response to ligand binding and usually do not require ATP to function directly. While cellular processes that recycle channels or power downstream signaling might depend on ATP, the basic gating mechanism of ligand-gated channels is not ATP-dependent, so their immediate opening is unlikely to be abolished by ATP absence.
Option 4: Aquaporin. Aquaporins are water channels that facilitate water transport across membranes. Their function is a physical pore property and does not require ATP to open or close for basic water conduction, so ATP depletion would not directly impair their primary transport role.

In summary, consider which option relies on ATP for its core activity: GPCRs depend on G proteins and second messengers rather than ATP for activation; ligand-gated channels and aquaporins do not require ATP for their primary gating; but receptor tyrosine kinases rely on ATP to phosphorylate substrates. Therefore, the ATP-depleting compound would specifically interfere with receptor tyrosine kinases, while the other options would not be directly crippled by the loss of ATP in their primary mechanism.

Which of the following will be affected by a compound that gets rid of ATP?单项选择题

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