4.b 5.c 6.c is the right answer
Answer: A. tunneling nanotubes
Explanation:
A tunnelling nanotube (TNT) also called membrane nanotube is a concept that has been applied to protrusions extending from the plasma membrane that enables different animal cells to interact over long distances, often over 100 μm between T cells.
There are two types of tunneling nanotube including one type of smaller than 0.7 micrometres in diameter which contains actin, and carries parts of plasma membrane in both directions between cells. The second type is larger than 0.7 μm that contains both microtubules and actin, and may carry cytoplasm components such as vesicles and organelles, including whole mitochondria, between cells.
TNT functions in the development of various diseases by allowing the movement of protein, pathogens aggregates and mitochondria.
Hence, the correct option is A. tunneling nanotubes.
Answer:
Cellulose (in the lettuce)
Explanation:
- A tossed salad usually consists of many vegetables such as lettuce, onions, tomatoes, cucumbers, etc. and then, these vegetables have added dressings which can be of different types.
- When a person eats a tossed salad then the lettuce will be least digested as it is composed mainly of cellulose and the human body is incapable of digesting cellulose.
- The inability to digest cellulose by human beings is because there are beta acetal linkages present in the cellulose and human beings lack the enzymes that can break the linkage.
- However, the undigested cellulose aids in the process of digestion as it acts like fiber and thus, the process of digestion can take place smoothly.
- Thus, the intake of cellulose-rich foods is also essential.
Answer:
d) diploidy
Explanation:
PKU is a genetic condition caused by changes in genes and are transferred through generations in a recessive inheritance pattern. PKU is caused by mutations in the gene PAH phenylalanine hydroxylase (PAH) which codes for an enzyme (type of protein) called phenylalanine hydroxylase. PKU is caused by an Autosomal recessive pattern i.e A person must have a mutation on BOTH of his/her two copies of the PAH gene in order to have PKU and this only occurs if both parents are carriers for PKU.
Now , What maintains the presence of this harmful allele(The recessive allele that causes phenylketonuria (PKU)) in a population's gene pool?
NOTE the word recessive!
The answer is Diploidy.
This is because, the term diploidy refers to a state of having two sets of the chromosomes (and therefore two copies of genes), especially in somatic cells. Therefore, the usefulness of this is to stabilize the chromosome if one of the chromosome(i.e one copy of the gene) is a carrier of PKU.
You can approach this question by finding one answer that is wrong or by eliminating the answers that are correct.
Glycolysis is the breakdown of glucose into pyruvate. If you already know that glycolysis is oxygen-independent, meaning it does not require oxygen, then you immediately know that A is incorrect, making that the correct answer.
However, you can also go about it by eliminating B, C, and D. In glycolysis, glucose is breaking down with the help of ATP bringing in energy, so that means glucose, the simple sugar, is breaking down, so C is out. ATP is bringing that energy to the mitochondria, so B is out. And the energy from ATP is being consumed, so D is out.