Answer;
A. During active transport, a material may be moved from an area of low concentration to an area of high concentration.
Explanation;
-Active transport involves movement of molecules or particles against a concentration gradient (from a region of low concentration to a region of high concentration). This movement of particles against the concentration gradient requires an input of energy from the cell in the form of ATP.
- Passive transport on the other hand involves movement of materials from a region of high concentration to a region of low concentration and does not utilize energy. Passive process are processes such as osmosis and diffusion.
Answer/ Explanation: Basophilic stippling is seen in excess of certain substances, such as lead or other heavy metals, in the body.
1. Basophilic Stippling: Basophilic stippling refers to the presence of small, dark blue or purple granules in red blood cells (RBCs) when viewed under a microscope. These granules are aggregates of ribosomes and RNA, and they appear as tiny dots or speckles within the RBCs.
2. Lead and Heavy Metal Poisoning: Basophilic stippling is commonly associated with lead poisoning or exposure to other heavy metals like arsenic or thallium. When these substances enter the bloodstream, they can affect the production and function of RBCs in the bone marrow.
3. Mechanism: The exact mechanism by which lead or other heavy metals cause basophilic stippling is not fully understood. However, it is believed that these substances interfere with the normal synthesis and maturation of RBCs, leading to the accumulation of ribosomes and RNA in the cells.
4. Diagnostic Significance: The presence of basophilic stippling in RBCs can be an important diagnostic clue for lead or heavy metal poisoning. It is often observed in blood smears of individuals with chronic exposure to these toxic substances. However, it is important to note that basophilic stippling is not specific to lead poisoning and can also be seen in other conditions such as certain anemias or myelodysplastic syndromes.
In summary, basophilic stippling is observed in excess of substances like lead or other heavy metals in the body. It is a microscopic finding characterized by the presence of small granules within red blood cells. The identification of basophilic stippling can be a useful indicator for the presence of lead or heavy metal poisoning, although further diagnostic tests may be required for confirmation.
B. the long arm of a chromosome
C. the center of a chromosome
D. the material of a chromosome
B) the long arm of a chromosome
The statement that 'an object at rest will continue to stay at rest and an object in motion will stay in motion in same direction and at constant speed unless some external force acts on the object' is a law of motion. This statement describes a fact which is base don the observations made by Newton. It is universally true and hence, it is not a hypothesis, or theory but a law.
Hence, the correct answer is 'law of motion because it is factual and based on observations'.
b. synapsis.
c. allele distribution.
d. tetrad formation.