Question:All known organisms use genetic information to produce protein molecules via the same genetic code. This finding strongly supports the hypothesis that __________.
a) the earliest macromolecules probably arose when lightning struck an oxygen-free atmosphere
b) all organisms are descended from one or a few common ancestors
c) the genetic code readily evolves by natural selection
d) there's only one possible way to encode information in a macromolecule
Answer:
b) all organisms are descended from one or a few common ancestors
Explanation:
Protein synthesis occurs when the nucleotide sequence of the mRNA is read in the form of genetic codes. A specific genetic code specifies the same amino acid in all living beings. For example, the code "UUU" codes for phenylalanine in all the living beings irrespective of their species. This suggests that all the life forms have originated from one or few common ancestors and the genetic code has been preserved during the course of evolution of various species.
Phagocytosis is the ingestion and destruction of particle matter by the amoeba
Nitrification or nitrogen fixation
<h2>Species richness </h2>
Explanation:
Resource partitioning is a type of strategy of coexistence among species which allow species to use natural resources in different ways and it may be temporal or spatial
There are two attributes of a community which will tend to lead to lower species richness in a community:
1) Most species are generalists, utilizing a broad spectrum of resources
: Species that can live in many different types of environments, and have a varied diet are considered generalists
2) Most species are specialists, utilizing a narrow spectrum of resources: Specialists are those species that require very unique resources, these type of species have a very limited diet or need a specific habitat condition to survive
The cuticle decreases water loss and stomata assist gas exchange. The plants from wet habitats must have a comparatively large number of stomata and thin cuticle. The plants existing in dry habitats must have comparatively few stomata and thick cuticle.
