Consider the following characteristics: these act like a digestive system, taking in nutrients, breaking them down, and creating energy rich cells. some cells have several thousand of them floating freely, while others will have very few. if a cell feels it needs more energy to survive, it will create more of these. sometimes they can grow larger or combine with others. this is all based on the needs of the cell. based on the characteristics above, what can you conclude about what is being described? a) it must be lysosomes. b) it must be mitochondria. c) it must be chloroplasts. d) it must be ribosomes.

The correct answer is option (B) It must be mitochondria.

Mitochondria are called the power houses of the cell.  It is because these organelles act similar to the digestive system. They take in nutrients, break down and digest them producing energy rich substances called the adenosine triphosphate (ATP). A few cells like the muscle cells have numerous mitochondria as they need lot of energy. The number of mitochondria is based on the energy requirement of the cell. Mitochondria can grow, divide and even fuse with the other mitochondria.

an individual’s sex (i.e., whether they are a male or female) is determined by the sex chromosomes. most people have two sex chromosomes, one that is inherited from their mother and one that is inherited from their father. typically, females have two x chromosomes (xx) and males have one x chromosome and one y chromosome (xy). conditions caused by changes (“mutations”) in genes located on the x chromosome are considered x-linked.

x-linked recessive inheritance

most x-linked conditions are recessive. this means that in a person with two x chromosomes (most females), both copies of a gene (i.e., one on each x chromosome) must have a change or mutation whereas in a person with one x chromosome (most males), only one copy of a gene must have a mutation. a female with a mutation in one copy of a gene on the x chromosome is said to be a “carrier” for an x-linked condition. a male with a mutation in a gene on the x chromosome is typically affected with the condition. because females have two copies of the x chromosome and males have only one x chromosome, x-linked recessive diseases are more common among males than females. however, x-linked recessive diseases can occur in both males and females.

for x-linked recessive disorders, an unaffected carrier mother who has a mutation in a gene on the x chromosome can transmit either the x chromosome with this mutation or a “normal” x chromosome to her children. if the father is unaffected, none of her daughters will be affected and all of her daughters will be unaffected—since they will inherit at least one normal x chromosome from their father. however, each daughter will have a 50% chance of being an unaffected carrier like her mother and a 50% chance of both x chromosomes being normal.

it's not c. i took the quiz and got it wrong. so my best guess is b.

have a great day, and hope this .