Answer:
Pigmentation of the skin results from the accumulation of melanin-containing melanosomes in the basal layer of the epidermis. Differences in skin pigmentation result both from the relative ratio of eumelanin (brown–black) to pheomelanin (yellow–red), as well as the number of melanosomes within melanocytes.
Explanation:
C. Radiation and chemotherapy can kill healthy cells
Explanation: radiation causes every cell around where it is put, to die, including healthy. Chemo and radiation don’t know the difference between healthy and unhealthy
Answer:
Since a sample of air at 35 ° C and 60% relative humidity holds 26.25 grams / cubic meter of water vapor. The same sample of air at 40 ° C can hold a maximum of 50 grams / cubic meter of water vapor. If the air currently holds 30 grams / cubic meter, then its relative humidity is 60%.
Explanation:
To solve the following question, the following calculations must be performed:
If 40ºC can have a maximum of 50 grams per cubic meter of water vapor, this would imply a total of 100% humidity. Thus, if 35º had 100% humidity, the amount of grams per cubic meter of water vapor would arise from the following calculation:
40 = 50
35 = X
35 x 50/40 = X
1750/40 = X
43.75 = X
Now, if this implies 100% humidity, to determine 60% humidity the following calculation must be carried out:
100 = 43.75
60 = X
60 x 43.75 / 100 = X
2625/100 = X
26.25 = X
Therefore, if with 100% humidity you have 50 grams per cubic meter of water vapor, with 60% humidity you would have 30 grams of water vapor per cubic meter.
Answer: C. A substrate
Explanation:
A substrate is a substance on which an enzyme act. The enzyme acts on substrate X and converts it to Y.
Answer:
The five parts of reflex arc are sense organs (receptor) followed by sensory neuron, then the inter neuron, motor neuron and lastly by the muscles/body organs.
Explanation:
The five parts of reflex arc are -
a) The first part is the receptor which comprises of sense organ whose function is to sense the impulse and pass the perceived information to the sensory neuron.
b) The sensory neuron then carry the information from sense organs to the central nervous system (CNS) for processing.
c) The inter neurons carry the information from CNS to the motor neuron
d) After receiving processed information/ action potential from inter neuron it is sent to the other parts of the body and away from the CNS
.
e) Lastly, the muscles/body organs which receive information from the motor neuron, enact as directed by the CNS as a response to the impulse received.
