The oxygen within the leaf must be expelled to allow the to leaf sink, the level of oxygen within the leaf could correlate to the rate at which the leaf sinks or how far the leaf is able to sink if it is able to sink at all
Answer:
Depolarization.
Explanation:
The electric membrane potential or cell potential may be defined as the difference in electric potential inside and outside of the cell. The membrane potential is important for the generation of action potential.
The opening of sodium channels in the membrane neuron causes the influx of sodium ions in the cells. This changes the membrane potential towards more positive and the cells depolarize.
Thus, the correct answer is option (A).
Answer:
The correct answers are statements 2nd, 4th, 5th and 6th.
Explanation:
The X-ray experiments performed by Rosalind Franklin and the experiments performed by Watson and Crick resulted in the discoveries of the DNA model. In the 1950s, the X-ray diffraction technique was used by Franklin to know more about the composition of DNA. With the assistance of the experiment done by Franklin, Watson and Crick deduced the model of the DNA helix.
The prime contribution in finding the molecular composition of DNA was done by Watson and Crick and was helped by the contributions done by Chargaff, Hershey and Chase, Linus Pauling, Franklin and Wilkins, and others.
Based on the X-ray experiment conducted by Franklin, it came to know that DNA produces a right-handed helical composition with two polynucleotide chains enveloped around a central axis.
Based on the discoveries made by Chargaff, a purine base comprises hydrogen bonds, which pairs with a pyrimidine base situated on the DNA strand present on the contrary. It came to know that A forms pairing with T and C forms pairing with G.
Alexander Todd an organic chemist discovered that the sugar-phosphate backbones of every DNA helix move antiparallel to each other.
Based on the X-ray experiment performed by Franklin, it came to know that 2 nm is the diameter of the DNA double helix, and each purine-pyrimidine base-pairing covers an equal distance between the two chains.
Cells<span> are </span>so<span> little, </span>so<span> they can maximize their ratio of surface area to volume. </span>