Answer:
1) B
2) A
3) A
4) D
Explanation:
An atom is neutral because it contains an equal number of protons and electrons. Though the atom actually contains neutrons, this reason does not explain the electrical neutrality of the atom.
The L shell actually contains eight electrons because the maximum number of electrons accommodated in each shell is given by 2n^2 where n is the principal quantum number. Since the L-shell corresponds to n=2 then the reason is the correct explanation of the assertion.
The valency of atoms is determined by the number of electrons in the outermost shell of the atom. Remember that atoms having a filed valence shell(eight electrons in the outermost shell) have a valency of zero. Hence the noble gases possess a zero valency. Thus the reason is the correct explanation of the assertion.
Nitrogen forms its ion by electron gain and not by electron loss because nitrogen forms an anion. This anion is formed by a gain of three electrons. The assertion is false but the reason is true.
Valence of oxygen is negative two.
The pine tree has unprotected seeds; the apple tree has seeds in fruit. The pine tree is vascular; the apple tree is a seedless, nonvascular plant. The pine tree thrives in warm climates; the apple tree thrives in cold climates.
<u>Correct sequential order for the following processes of protein synthesis are as follows:</u>
- DNA strands unwind and separate
-
mRNA copies DNA according to complimentary base pairing
- mRNA leaves the nucleus
- tRNA’s anticodons bring amino acids to the corresponding mRNA codons at the ribosomes
- amino acids bind to each other making a polypeptide
-
a stop codon is reached, the newly formed a protein is released to go do its job for the cell
Option A --> B --> C --> E --> D -->F
<u>Explanation:</u>
Protein synthesis involves three major steps which are Replication of DNA, which is then transcribed and then translated to form protein, so the steps are Replication, Transcription and Translation.
Firstly, the DNA is a double stranded molecule which needs to be unwind as a replica where one of the strand becomes the template strand and transcription of strand occurs with mRNA.
mRNA thus leaves the nucleus and reaches cytoplasm where translation takes places and the tRNA provides specific anti codons to the mRNA codons and the amino acids are formed.
All amino acids bind to each other in order to make a polypeptide and hence the protein molecule newly formed is released to the cell.
Frameshift, you can either add or delete genes.
Hope this helped! :D
