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>.
In 1935 the government finally addressed the issue of the issue of people not having electricity.
Answer:
Generally both theses two region are similar in the concentration of salt water they contain(both have salt water) and both have hard surfaces.
However, the Coral reefs are usually warm, with sunny environment. It is always submerged,( always covered by water), and very shallow.Complex animals of the aquatic bodies are in the coral reef from varieties of fishes, (shark, rayfish to sponges, etc,. These animals compete for space.
The intertidal zone, one of the three zones, of a typical reefs,is a marine shoreline with constant exposure to air.Hence always above water,unlike Coral reefs.
The continuous fluctuation in tides always change the intertidal zone. Due to constant aeration fro tides, varieties of animals like sea urchins,sea-stars, limpets fished and diverse phyla of species populated this environment,
Answer: sea floor (at the very bottom of the ocean)
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The water lilies may adapt to needing less water, both to drink and to live. The flowers will try to adjust to their new habitat by needing less water as there is less available.