Astudent performed an experiment to demonstrate that a plant needs chlorophyll for photosynthesis. he used plants that had green leaves with white areas. after exposing the plants to sunlight, he removed a leaf from each plant and processed the leaves to remove the chlorophyll. he then tested each leaf for the presence of starch. starch was found in the area of the leaf that was green, and no starch was found in the area of the leaf that was white. he concluded that chlorophyll is necessary for photosynthesis.
which statement represents an assumption the student had to make in order to draw this conclusion?
(1) starch is synthesized from the glucose produced in the green areas of the leaf.
(2) starch is converted to chlorophyll in the green areas of the leaf.
(3) the white areas of the leaf do not have cells.
(4) the green areas of the leaf are heterotrophic.

1

Explanation: photosynthetic plants possess a double membrane organelle called chloroplast.this chloroplast contains chlorophyll chlorophyll are the reason plants

are green,they are green pigments which absorbs wavelengths of sunlight that is used in the production of glucose and other products through photosynthesis.this glucose is converted to starch ,which is the form it is stored

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.

bradykinin is a physiologically and pharmacologically active peptide of the kinin group of proteins, consisting of nine amino acids.