The answer is <span>D. The Plasmodium life cycle would be interrupted, and the infection could not be passed on.
Mosquitoes are necessary for malaria infection. According to the lyfe cycle, after infected mosquitoes bite a human, they inject saliva with sporozoites into the human circulatory system (stage A). The sporozoites enter human liver where they divide and schizonts are created. Schizonts give birth to merozoites (stage B). Merozoites are released into the bloodstream where invade red blood cells (stage C). Inside the red blood cells, they evolve into trophozoites, they into erythrocytic schizonts, and finally into a new generation of merozoites (stage D). After the red blood cells rupture, they are released into the blood stream (stage E). Therefore, if mosquitoes disappear, the first stage (stage A) will be missing, so the plasmodium life cycle will be interrupted.</span>
Answer: The circulatory system and the respiratory system.
Explanation:
Gas exchange between tissues and the blood is an essential function of the circulatory system. In humans, other mammals, and birds, blood absorbs oxygen and releases carbon dioxide in the lungs. Thus the circulatory and respiratory system, whose function is to obtain oxygen and discharge carbon dioxide, work in tandem.
Answer:
C. Darwin's explanation of natural selection
Explanation:
<em>According to Darwin, natural selection selects for traits that are more adaptable to an environment and individuals with such traits tend to reproduce and contribute more offspring to successive generations.</em>
As the environment keeps changing, organisms keep trying to adapt to the changes. Those who are able to adapt flourish more within the environment while the weak ones gradually get replaced in the population.
In the case of sickle cell heterozygosity and malaria; individuals that are heterozygous for the sickle cell trait are generally known to be less prone to malaria. Hence, this becomes a selection advantage over individuals with other genotype forms. Heterozygous individuals thus contribute more offspring into the population than other genotype forms according to natural selection law.
The correct answer is C.
Answer:
The energy a cell needs to build molecules or to power cellular respiration is supplied by mitochondria.
Explanation:
Mitochondria are tiny cell organelle present in eukaryotic cells. It is called the powerhouse of the cell. It is referred to as such because it produces most number of energy molecules or ATP that is released from food. It produces 36 molecules of ATP and the cell produces 2 molecules of ATP. This process of releasing energy from food by the mitochondria is called cellular respiration. These energy molecules are then used in various other cellular activities.
<span>The answer is C. Crossing over mostly
occurs during meiosis I when sister chromosomes are lined up in the metaphase
plate awaiting anaphase I where the sister chromosomes are pulled to separate daughter
cells by spindle. It is during this period that the chromatids of the sister
chromosomes come together at a point (chiasma) and share genetic material in a process called
crossing over. </span>
