Answer:
The answer is A.
Explanation:
B) Nucleotides and amino acids can act as extracellular signal molecules:
ATP is made of adenosine (a type of nucleotide) and used in cell signalling called "purigenic signalling" and amino acids are also used as signal molecules.
C) Some signal molecules are transmembrane proteins:
Transmembrane acts as receptors for smaller signal molecules so this can also be accepted as true.
D) Some signal molecules can bind directly to intracellular proteins that bind DNA and regulate gene transcription:
That is also true, some of the hormones can cross lipid membrane of the cells and bind directly to the intracellular (inside-of-a-cell) proteins.
Lastly; dissolved gasses such as nitric oxide can activate proteins such as guanylyl cyclase so this choice is <u>false</u>.
Answer:
ADP stands for adenosine diphosphate. AMP stands for adenosine monophosphate. Therefore, one difference between ATP, ADP, and AMP is the number of phosphates associated with each compound. ... Thus, ATP has the most stored energy and AMP has the least amount of stored energy.
<span>Answer is b. having older brothersOne factor that may cause the teen to be sexually active is the use of alcohol and drugs. Drugs and alcohol can impair one’s good judgment, so the willingness to take risks is increased. Peer pressure can also be a reason for a teen to be sexually active because teens don’t want to be different or rejected by their friends.
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Radioactive dating, depending on the certain amount of radioactive decay it leaves through the years you can predict the oldest one!
if that helped make sure to mark brainliest! <3
-procklown