Answer:
Solution
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Correct option is
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion.
Prokaryotic cells have a cell wall surrounding the cell membrane. The fluid matrix filling the cell is the cytoplasm. There is no well-defined nucleus. The genetic material is basically naked in the cytoplasm, not enveloped by a nuclear membrane. The nuclear membrane is found in eukaryotes. The prokaryotic cells lack mitochondria, endoplasmic reticulum, Golgi apparatus, lysosomes, microtubules, microfilaments, and centrioles.
Cytoplasmic streaming, also called cyclosis, is the directed flow of cytosol (the liquid component of the cytoplasm) and organelles that aids in the delivery of organelles, nutrients, metabolites, genetic information, and other materials to all parts of the cell. In prokaryotes, cytoplasm does not show cyclosis or streaming movements.
So, the answer is A.
Answer: The fat has a lower density than the other parts of the milk.
Explanation:
Milk is a dairy product which is produced by the mammary gland of mammals such as cow, goat, pigs and even human beings used for the nourishment of their younger ones. Milk gotten for cow is usually processed and consumed by man. It's constituents includes the following:
-> water,
-> lactose
-> fat
-> protein and
-> minerals.
The fat component of milk can be separated by simply allowing the fresh milk to stand for a period of time and the top layer of fat removed. This is possible because fat has a lower density than the other parts of the milk. In the dairy processing, when fresh milk is allowed to stand for a period of time, the fat globules would begin to rise to the surface in a phenomena called creaming.
Answer:
25% or 1/4
Explanation:
The gene for colour in Heliodors is controlled by two contrasting alleles that codes for Red (R) and Yellow (Y) colours. However, these two alleles exhibit incomplete dominance, which is a phenomenon whereby a combination of both alleles gives rise to a third intermediate phenotype that is a blending of the other two parental phenotypes. In this case, both colours gives rise to a heterozygous Orange coloration (RY) in Heliodors.
However, if two orange Heliodors (RY) are crossed, four possible offsprings will be produced with the genotypes: RR, RY, RY, YY. This shows a phenotypic ratio of 1 red: 2orange: 1yellow. Hence, the probability of having a child with red coloration is 1 out of 4 possible offsprings i.e. 1/4.
Expressing this in percentage, we have 1/4 × 100 = 25%.
Answer: Bacteria are much larger than viruses, and they are too large to be taken up by receptor-mediated endocytosis. Instead, they enter host cells through phagocytosis. Some pathogens, however, have acquired the ability to survive and replicate within macrophages after they have been phagocytosed.
Explanation: This is my answer
