Answer:
<h2>DNA mutation rate and Homologous structures.</h2>
Answer:
Echocardiography
Explanation:
Echocardiography is a painless test that uses the sound waves called ultrasonic waves with a frequency exceeding 20 kHz is used to produce images of the heart.
The echocardiography is also known as the ultrasound of the heart which is performed to check the blood clots, the aorta related pictures and the functioning of the valves of the heart.
The picture produced by this echocardiography is known as the echocardiogram and is used to treat heart disease.
Thus, Echocardiography is the correct answer.
Answer: The answer is C. An iron atom located on the heme portion hemoglobin
Explanation: Hemoglobin is responsible for the transportation of oxygen in the red blood cells to tissues of vertebrates. It is the protein molecule found in the red blood cells.
Hemoglobin is made up of 4 heme molecules surrounding the globin group, forming a tetrahedral structure. The heme molecules contain one atom of iron each and this is the binding spot for each molecule of oxygen through a covalent bond. Therefore, each hemoglobin molecule can have up to four molecules of oxygen attached to them.
Answer:
Option C
Explanation:
Complete Question
Which of the following situations would pose a major difficulty for applying the biological species concept?
a) Two populations of sexually reproducing plants that can be bred easily in the same location under field conditions
b) Two populations of sexually reproducing insects that can be bred easily in the same location under field conditions
c) Five snail fossils taken from the same locality during a 400,000-year time span
d) Dimorphic mating pairs of birds
e) Monomorphic mating pairs of birds
Solution -
According to the biological species concept, two or more organisms that look alike does not mean that they belong to the same species. In order to consider that two organisms belong to the same species, it is essential for them to be able to interbreed or mate.
For example –
Western meadowlarks and Eastern meadowlarks look identical to one another but they do not interbreed with each other and hence they belong to different species.
Hence, option C is correct
