Acertain population of beavers builds dams across a stream to catch fish. some years the stream carries more water than other
years! the data below was collected by scientists studying the stream over a sixteen year period.
average stream depth average number of average number of
years
(meters)
beaver dams beavers
2000-2003 1.20
- 17
2004-2007 0.92
- 12
2008-2011
1.45
7
21
2012-2015 0.78
2
if the average depth of the stream for the next 4 years is 1.60 meters, which of the following is most likely to occur?
a.
the average size of each beaver will increase.
b.
the size of the beaver population will increase
c.
the size of the beaver population will decrease
d.
the average size of a beaver dam will decrease
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many other transport proteins, often called pumps, move materials against a concentration gradient. active transport drives molecules across a membrane from a region of lower concentration to a region of higher concentration. this process, shown in figure 5.1, uses transport proteins powered by chemi- cal energy.

ans.

dna fingerprinting is defined as a process that determines the dna characteristics of an individual. these dna characteristics are unique among individuals as their fingerprints, so it is known as dna fingerprinting.

steps of dna fingerprinting includes extraction of dna from sample, amplification of dna, restriction digestion of amplified dna, and then analysis of dna by gel electrophoresis, respectively.

thus, the next step performed by the scientist is 'to cut the amplified dna (obtained by polymerase chain reaction) by restriction enzymes that cleave the dna into fragments and their analysis.'

it provides an alternative energy pathway for the reaction to proceed.

a catalyst is a substance that speeds up the rate of a chemical reaction but is not consumed during the course of the reaction.

catalysts increase the rate of reaction without being used up. they do this by lowering the activation energy needed. with a catalyst, more collisions result in a reaction, so the rate of reaction increases. different reactions need different catalysts.

a catalyst works by providing an alternative reaction pathway to the reaction product. the rate of the reaction is increased as this alternative route has a lower activation energy than the reaction route not mediated by the catalyst.

you know they are heterozygous for a trait because they have it as jj or jj.