Answer:
The answer is A. 20.2
Explanation:I took the test
Imagine you have a cup that has 100ml water, and you add 15g of table sugar to the water. The sugar dissolves and the mixture that is now in the cup is made up of a solute (the sugar) that is dissolved in the solvent (the water). The mixture of a solute in a solvent is called a solution.
Answer:
Question 17: Silent mutation.
Question 18: Neutral.
Question 19: Beneficial (but see explanation below).
Explanation:
17)
A silent mutation is defined as a change in coding DNA which does not have an effect in the amino acid produced during translation. Silent mutations are possible because the genetic code is degenerate, meaning that a given amino acid may be coded by more than one codon. For instance: a mutation changing AUGCUA to AUGCUG is likely to be silent, since both the CUA and CUG codons code for the same amino acid (Leucine).
Note that a silent mutation may well <em>also</em> be a point mutation (meaning: involving the change of a single nucleotide). In fact, the example given above would meet that criterion. However, the question as stated does not contain enough information for making that call in this particular case.
18)
This particular question asks us to extrapolate from a given level of organization (function of a specific type of protein) to a higher one (overall functioning and/or wellbeing of the whole organism). <em>In general</em>, it can be assumed that mutations which change a given protein’s sequence without altering its function will have a negligible effect on the organism’s fitness. Such mutations are therefore called neutral. Note that the neutrality of a mutation may not always be self-evident, however, due the fact that a given protein may have <em>several</em> functions, the measurement of which may not be feasible.
19)
The answer in this question really depends on which specific example one may happen to be working with. Broadly speaking, higher efficiency tends to be associated with beneficial effects (e.g. assume an increase in the efficiency of an enzyme which breaks down a certain type of toxic substance present in food). One may found counterexamples, however. Picture another enzyme, which normally plays a role in disaggregating blood clots during normal blood coagulation. An increase in its efficiency could potentially lead to premature disaggregation of clots and hence prolonged bleeding.
Answer:
competition, predation, commensalism, mutualism and parasitism.
Explanation:
<h2>Answer with Explanation </h2>
The hypotonic solution is that soultion which the amount of solute is in low concentration. If the cell is placed in a hypotonic solution then a cell fills up with water by the process of osmosis. This process starts to swells but the cell wall prevents the cell to get burst, which is the natural process within the animal cell. The pressure inside the cell increased until the inter pressure is equal to the pressure outside the cell.
