Answer:
e) unicellular, colonial, or multicellular.
Explanation:
Protists originates from the Kingdom Protoctista. They comprise of organisms that are unicellular (Amoeba) or unicellular-colonial (volvox) in nature and which have no tisssues, therefore they are at the cellular level of organization.
Examples include, Amoeba, Paramecium, Euglena, Slime mold, Kelp, Diatoms, DInoflagellates. etc.
Some of them are also considered to be multicellular eukaryotes e.g slime molds, red algae etc. Eukaryotic organisms are organisms that possess cells containing a nucleus.
Characteristics in which protists exhibit varies from one species to the other.
For example, the mode of nutrition in eukaryotic algae are autotrophic in nature, in amoeba, they are gifted with pseudopods(false feets) in which they used to engulf prey(a term known as phagocytosis) therefore making them to be heterotrophic in nature.
In protist, locomotion varies from one organism to another. For example, in Amoeba , locomotion is achieved by extending and retracting pseudopods, Euglena are flagellated in nature , hence they move with the flagella. In Paramecium that are ciliated in nature, they move by propelling their cilia. etc.
Answer:
Causes fetal gonads to develop as testes shortly after fertilization.
Explanation:
The SRY gene is a sex-determining gene that is located on the Y chromosome. It is responsible for the production of a protein which is a testis-determining factor that enhances the development of a testis.
The SRY gene plays an important role in gender determination. Mutations that takes place in the SRY gene give rise to XY females with gonadal dysgenesis which is a developmental disorder of the reproductive system in the male or female. The individuals appear to be normal females at birth, but during the stage of puberty, they do not develop secondary sexual characteristics, they do not menstruate, and have fibrous gonads that does not contain eggs.
Answer:
Inversion
Explanation:
This type of mutation is not as lethal on addition of deletion mutations. This is because it does not cause a frame-shift mutation. Inversion only reverses the order of nucleotides in a section of a DNA strand and the genes in this regions may produce defective proteins.
Answer:
Water (H2O)
Explanation:
Light reactions of photosynthesis release oxygen as a by-product. In the presence of sunlight, photolysis of water molecules occurs. Splitting of two water molecules obtains four electrons, four protons, and molecular oxygen. The oxygen-evolving complex, also called the water-splitting complex is associated with photosystem II (PS II). Splitting of water occurs in the oxygen evolving complex and the released electrons are passed one at a time to the reaction center of PS II. Therefore, a water molecule serves as a source of oxygen released during photosynthesis.
