Unicellular organism can
also be refers to as single-celled organism and they are made up of one cell compared
to multicellular organism that have more than one cell. These organisms fall
into two groups: prokaryotic organisms (bacteria and archaea) and Eukaryotic organisms (unicellular fungi, protozoa, unicellular algae).
Thus, unicellular organism
can live in hot or cold environment and these characteristic give hopes to
scientist that these organisms can be found in any other planets.
Answer:
Answer is False.
Explanation:
The movement of molecules or materials through or across the cell membrane, usually from a lower concentration to a higher concentration, which requires the use or consumption of energy, is known as active transport.
The energy required by this process is in form of Adenosine triphosphate, ATP. Example is sodium - potassium pump.
<span>Some animals and plants are only known to us as fossils. By studying the fossil record we can tell how long life has existed on Earth, and how different plants and animals are related to each other.
Dats the answer^^^</span>
Answer:
Sickle cell disease is due to a type of substitution mutation.
Explanation:
Sickle cell disease is a condition that is transmitted from parents to children in an autosomal recessive inheritance pattern. It is due to a mutation that is capable of altering the shape of the erythrocyte, as well as its ability to circulate and carry oxygen.
The mutation that occurs in sickle cell disease is due to an alteration in the β-chain of hemoglobin, caused by the substitution of thymine base by adenine in the DNA that determines it. As a result, valine replaces glutamic acid in the β-chain amino acid sequence, with the consequences described.
- <em>The other options are not correct because </em><u><em>deletion, duplication and translocation </em></u><em>correspond to chromosomal mutations, not responsible for sickle cell disease.</em>
Answer:
Smoking and cardiovascular disease
Smoking increases the risk of cardiovascular disease in several ways:
Smoking damages the lining of the arteries, including the coronary arteries. The damage encourages the build-up of fatty material in the arteries. This can lead to a heart attack or a stroke.
Inhalation of carbon monoxide in cigarette smoke reduces the amount of oxygen that can be carried by the blood.
The nicotine in cigarette smoke increases the heart rate, putting strain on the heart.
Chemicals in cigarette smoke increase the likelihood of the blood clotting, resulting in a heart attack or stroke.
Explanation:
