• Homologous structures: Both Ostriches have wings similar in form to those of their ancestors, but that do not allow the birds to fly.
Homologous structures are those that have structural similarities but are different in function. For example, if we look at the anatomical structure of a bird’s wing, it is very similar in structure with a human arm. However, over the course of time they have evolved to perform different functions.
• Vestigial structures: The inner ear bones of mammals have evolved from bones that form the jaws of reptiles.
Vestigiality refers to the process in which some structure lose their function over the course of evolution in some specie but they are functionally normal in other species. Such a structure is the inner ear bones of mammals which donot perform an important function in mammals but do perform in reptiles.
• DNA sequence data: Both Genes involved in RNA replication are conserved among bacteria and animals, suggesting a common evolutionary origin.
The sequencing of genetic data is an excellent method of finding the evolutionary histories and relatedness of different organisms. This field of sciences is called phylogenetics and the mentioned example is the result of phylogenetics.
• Analogous structures: The jointed legs of insects and vertebrates arose independently, indicating a different evolutionary origin.
Analogous structures are those that have similar function but they look very different in structure or anatomy. This is because they have been evolved from different ancestors and perform different functions. One example of these structures is mentioned, The jointed legs of insects and vertebrates that look different bur perform same function.
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.
Potato cells contain 48 chromossomes in their DNA which means that when a cell divides, each daughter cell will have 24 chromossomes since:
48 / 2 = 24
Hope it helped,
BioTeacher101
In this case, the EEG monitoring takes place for a longer Duration of time
The CPT code for the EEG for an extended period of time is 95812 and 95813. The Code 95812 covers duration of 41-60 minutes and the code 95813 covers the duration of more than an hour. On an average, the duration of the carotid endarterectomy is more than an hour. So, the most appropriate code for this EEG is 95813.
The right option is; State 1 is liquid and State 2 is gas.
Liquid and gas states of matter are forms in which matter can exist and they both make up fluids and are present in the water cycle. The particles of liquid take the shape of the container it occupies and they have a fixed volume, while the particles of gas also expand to fill their containers and take the shape of its container. Liquid particles are not easily compressed, but gases are easily compressed by mechanical forces.
