Answer:
abt 24 contraction per min is needed to maintain a relatively stable internal solute conc.
paramecium maintain its volume by preventing itself from shrinking by holding in as much water as it can.
When the water solute concentration is reduced, the number of vacuole contractions will increase. But when the water solute concentrations rise, the number of vacuole contraction will decrease.
When the number of vacuole contractions will increase, the water solute concentration is reduced. But when the water solute concentrations rise, the number of vacuole contraction will decrease. So it is cetris paribus, means when the one is increase the other one will decrease.
<span>The set point theory is when your metabolism adjusts to keep your body weight consistent. It says that humans have predetermined body weight or fat content and they body closely regulates your metabolism accordingly.</span>
Answer:
E. 1/600
Explanation:
Hint:
The probability of fixation of a new neutral mutation is 1/(2N)
Given N as 300
= 1/(2×300)
=1/600
Therefore,
1/600 gives a sure fixation of one allele from the large population
When the stomach is stimulated, its environment would be describe as
acidic. The stomach releases proteases enzyme and hydrochloric acid to help in
digestion. The presence of hydrochloric acid will maintain low pH of the
stomach, which make the enzyme proteases to work best in cleaving proteins.
After the meal has been digested, the stomach pH returns to its resting level. Therefore,
the stomach secretes acid in response to food that aids in proper digestion.
Answer:
Some insects with Bt resistance genes are able to survive in the presence of Bt toxin. Natural selection favors these insects and increases their proportion in future generations.
Explanation:
Some of the insects in the insect population have one or more genes that impart Bt resistance to them. These insects are able to survive in the presence of Bt toxin while the ones that lack these genes simply die by Bt toxin. Natural selection allows these insects to leave more progeny in the future generation which in turn results in increased frequency of the Bt resistance gene in the future populations. This results in the spread of Bt resistance among insect populations.
