The attraction that holds two covalently bonded atoms together is called covalent bond
Answer:
Venus is not ideal for supporting life because it has a thick atmosphere which causes extremely high temperatures.
Explanation:
- Venus is the second planet near to the sun in solar system.
- It is called the twin of Earth because of its almot similar size.
- It completes one revolution in 225 days.
- It is the hottest planet on in the solar system having temperature near 735 K which is more than mercury, the nearest planet to the sun.
- The high temperatures of Venus results from its extremely dense and Carbon dioxide rich atmosphere. The atmosphere is surrounded by thick clouds of sulphuric acid that cause sulphuric acid rains.
- It is known as evening star.
Answer:
the 4rd one
Explanation:
i ask Google and socratic
Answer: It is called Parasitism.
Explanation:
Parasitism is symbiotic relationship where an organisms lives in or on it's host thereby feeding and causing harm on it host. Examples of such relationship is parasites like roundworm, ticks, fleas that feed on humans and cause harm.
Answer:
Thymidine dimers is likely to be repair as soon as it is originated but if left unrepaired then it causes frame shift mutations.
Explanation:
In case of Bacterium if UV irradiation induces covalent linkage of two thymidine present adjacently to each other or on a single strand to make thymidine dimers.
These either excised via DNA repair enzyme like Endonuclease V and the proof reading activity of DNA polymerase I enzyme help in incorporation of nucleotide by taking the unmutated original strand as a template.
These dimers if not excised before second round of replication than the sequence of newly synthesized strand will be altered. As DNA polymerase III enzyme read thymidine dimers as single thymidine nucleotide and incorporate only 1 adenine in the newly synthesizing complementary strand which results in frame shift mutations
It is the mutation in which reading frame of codons is shifted or altered due to deletion or addition of a single nucleotide.
