Answer:
The options:
a) 6
b) 6000
c) 6 x 10^19
d) 0.6
The CORRECT ANSWER IS a)
a) 6
Explanation:
Base pair changes
= genome size × frequency of a base pair change
Given,
genome size = 6 x 10^9 bp
frequency of a base pair change = 10^-9
=6 x 10^9 x 10^-9
= 6 × 10^9+(-9)
= 6 × 10^9-9
= 6 × 10^0
= 6 × 1
= 6 base pair changes
A Ice Age would probably happen because if earth did not have that heat it would get really cold an start a ice age and nothing would grow or live.
Answer: it is particularly rich in nutrients
Explanation:
Answer:
Since the origin of humans on this planet, they have been trying their best to make their lives easier on this planet. In doing so, human activities have some how heavily damaged the Earth. Many day to day activities of humans are dangerous for the Earth.
Some of the consequences of human activities on the Earth's fresh water are :
Extinction of many aquatic species:
The water consumed by humans comes from the fresh water oceans. As the population of humans is increasing enormously, the water from the oceans is being consumed at dangerous levels. This has caused many species of aquatic animals to become extinct or to be at a verge of extinction as they do not have a habitat to survive or reproduce.
Pollution:
Many heavy industries, house sewage, farmers dispose waste into the fresh water. Hence, killing aquatic animals and polluting the fresh water ecosystems.
Answer: Na+ channels are closed
Explanation:
The refractory period describes a period between the initiation of an action potential (where Na+ channels are active/open), and immediately after the action potential’s peak. In the absolute refractory period, action potentials cannot be generated, as Na+ channels are in an inactive or closed state, they usually take around one or two minutes.
After the absolute refractory period the relative refractory period (RRP) occurs. During the RRP, it is hard to send another action potential. Na+ channels are once again open, but the cell remains hyperpolarized- its membrane potential, remains negative. Recovery from inactivation is voltage and time-dependent; Action potentials would require an influx of more positively charged ions. These must be more than a specific threshold in order to have the cells send along more action potentials which helps with figuring out stimulus intensity.
