Ascientist is studying the various prokaryotic and eukaryotic species found floating in a sample of water taken from a marine ecosystem. which cellular component will be found in the widest range of organisms in the sample? a. the chloroplast, since all organisms need a source of energy. b. the ribosome, since all organisms need to synthesize proteins. c. the mitochondrion, since all organisms need to break down glucose. d. the cell wall, since all marine organisms need them for support.

b. The ribosome, since all organisms need to synthesize proteins.

Explanation:

Ribosomes are found in all forms of life, allowing for comparison of the widest possible range of plankton species.

any abiotic or biotic factor in an ecosystem that causes a population's size to slow or decrease is a limiting factor.

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.