Answer:
c. Major groove
Explanation:
The interaction surfaces of proteins are, in general, varied. From the point of view of the secondary structure, the surfaces of the proteins are formed by the surfaces of their α helices, β sheets and loops that conform them. The surfaces of the DNA molecules are less varied: the B-DNA helix has a monotonous “screw” shaped surface with phosphoribose ridges between which two grooves (major and minor) are formed. The difference between different nucleotide sequences can only be seen from outside in the major groove, where the bases appear. The surfaces of RNA molecules that possess tertiary structure (such as t-RNA) are almost as complex as that of proteins.
Since the major groove is the only site where the bases are accessible from outside the B-DNA without distorting it, the major groove constitutes the main recognition site. As the interaction between molecules is stronger if their surfaces are complementary, the protein-DNA interaction usually occurs by filling the major groove.
Answer:
Many people are familiar with hibernation, the winter practice of some mammals such as bears, and even some plants. It is commonly thought that snakes also hibernate because we don’t see them as much in the colder months, but this assumption is mistaken and could lead to unexpected – and likely unwanted – snake run-ins.
Hibernation is the state of very deep sleep where the animals or plants will stay dormant to conserve energy until the cold season passes. For example, bears will often gorge on food to build up their fat stores then go into hibernation because their food source will be very low in the winter months. The hibernation state helps them survive the winter by lowering their body temperature, slowing their heartbeat and breathing, depressing their metabolism, and exerting little to no energy. Their bodies then use up the stored fats to maintain their necessary body processes and to keep them warm through the season.
Unlike mammals, snakes don’t go into full hibernation. Instead, snakes enter a similar state called brumation.
The answer is A. A complex substance breaks down into two or more simple substances.