The process by which two species evolve as a response to changes in one another over time is called, "coevolution" thus the correct answer is that it is an example of COEVOLUTION
B) Nucleoli are large protein complexes that cross the nuclear envelope in eukaryotic cells.
C) Nucleoli are thin, dense meshworks of fibers lining the inner surfaces of the inner nuclear membranes of most eukaryotic cells.
D) Nucleoli are structures made of DNA, RNA, and protein that are present in the eukaryotic nucleus.
Answer:
Option-D
Explanation:
The nucleolus is a structure present in the nucleus of the cell which is important for the cell.
The nucleolus provides the site of transcription of the rRNA genes and the enzymes required for transcription. The nucleoli appear condensed structure as the rRNA genes, some portion of DNA and the proteins in the form of the enzymes like RNA polymerase I.Therefore, nucleoli are made of the DNA, RNA and the proteins.
Thus, Option-D is correct.
Answer: Option D
Explanation:
The nucleolus is the largest structure which is found in the nucleus of the eukaryotic cells. It is the main site for the ribosome biogenesis.
Nucleoli consists of DNA and RNA, proteins and it forms around the nucleolar organizing regions. it also help in cell signaling.
These are like envelops which bounds the nucleus inside it. In case of the treatment of cancer, the main target is nucleolus.
B) Capillaries deliver oxygen-rich blood to the heart; arteries bring oxygen rich-blood away from the heart; veins deliver blood to individual cells.
C) Capillaries deliver blood to individual cells; veins generally deliver oxygen-depleted blood to the heart; arteries generally bring oxygen-rich blood away from the heart.
D) Capillaries bring oxygen-rich blood away from the heart; arteries deliver blood to individual cells; veins deliver oxygen-rich blood to the heart.
B. phospholipid
C. integral protein
D. peripheral protein
the effect of natural disasters on the environment
b.
the effectiveness of current environmental law
c.
the effect of species loss on the environment
d.
the effect of dioxin on organisms in the environment
The effect of species loss on the environment is researched by an ecologist in an ecosystem. Thus option C is correct.
An ecosystem is defined as the structural and functional unit of where the living organisms interact with each other and their surrounding and was coined by A.G.Tansley, an English botanist, in 1935.
The basic components of an ecosystem are Biotic Components and Abiotic Components, both the components are interrelated with each other by doing energy flow.
Biotic components belongs to all living components like autotrophs, heterotrophs and saprotrophs. Autotrophs or producers like plants.
Second is consumer or heterotrophs which depend on other organisms for their food, can be primary consumers, secondary consumers and tertiary consumers.
Primary consumers are herbivores, Secondary consumers can be either carnivores or omnivores. Tertiary consumers get energy from on secondary consumers.
Quaternary consumers are carnivores and Decomposers include saprophytes feed on dead and decaying matter.
Thus option C is correct.
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