1 dna polymerase a adds new nucleotides to a strand b...

1. DNA polymerase a. adds new nucleotides to a strand. b. proofreads DNA strands to ensure that they are correct. c. makes rare mistakes resulting in mutation. d. is an enzyme. e. is all of these. 2. The three "stop" codons cause what to happen? a. They cause the ribosome to stop building a protein. b. They instruct ribosomes to build proteins. c. They initiate DNA replication. d. They code for three amino acids. 3. True-False. Messenger RNA is not the same length as the entire chromosome. True False In transcription in eukaryotic cells, RNA polymerase: a. cannot function until the two sides of the entire chromosome have completely separated. b. 5' caps are removed from the messenger RNA. c. needs RNA primase to lay down 5-10 RNA nucleotides as a primer. d. cuts the hydrogen bonds holding together DNA base pairs A-T and G-C. 4. Which is FALSE concerning a codon? a. a single codon never codes for more than one amino acid. b. two or more codons may code for the same amino acid. c. codons are unique to each species. d. a single codon consists of three nucleotides. 5. The anti-codon of individual transfer RNA molecules is a. the part of transfer RNA that bonds to a specific amino acid. b. complementary to the corresponding codon in ribosomal RNA. c. complementary to the corresponding codon in messenger RNA. d. the "stop" codon which ends translation of an mRNA strand.

Transcript

00:01 Hello students, tidio dissolving a question in biology.

00:03 As i can see from the question, this is a multi -tier question, meaning there are several sub -questions within the same text.

00:09 So the first question here is saying us that, dna polymerase does what among the following? so they've basically given us a mcq and they've given us choices and they're saying us to find which among the following does dna polymerase do.

00:24 Now we know that dna polymerase is used for addition of names.

00:30 Nucleotides.

00:31 Okay.

00:33 Dna is used for dna polymerase is used for addition of new nucleotides to a stand.

00:40 And dna polymerase 2, which is an enzyme from dna polymerase class, helps in proofreading.

00:47 They help in proofreading, removing all replication errors.

00:52 And the dna polymerase makes very few mistakes.

00:56 It makes rare mistakes.

00:59 And since it does mistakes this rarely, these rare mistakes result in mutation.

01:06 That is incomplete proof reading can sometimes result in mutation.

01:12 And this dna polymerase can also be recognized as an enzyme.

01:19 This is because dna polymerase catalyzes the process of replication.

01:24 Dna polymerase catalyzes the process of dna replication.

01:35 So we can see that all of the points mentioned here are all of the points mentioned in the question as well.

01:43 Therefore a right answer for this question is option e.

01:48 The right answer for this question is option a.

01:52 All of these is the right answer.

01:54 Okay, therefore we can say option e is the right answer for this question.

02:03 The second question is saying us that this three stop codons of m rna causes what to happen.

02:10 Okay.

02:11 We know that these top codons, okay, these top codons are uag, uga, uga, and uaaa.

02:24 U -a -g is called as amber, uga is called as opal, and uaa is given the name as ochre.

02:36 So these are the tree stop -corons and the main function of these top corons is cause the rhizome to build proteins.

02:44 These top corons disrupts the process of translation.

02:50 Disrupts process of translation.

02:55 And therefore they cause the rhizome to stop building a protein.

03:01 Therefore a right answer for this question is option a.

03:04 They cause ribosomes to stop building the protein.

03:16 And therefore we can conclude that the right answer for this question is option a.

03:24 They cause ribosome to stop building a protein is the right answer.

03:29 The third question here is asking us that messenger rna is the same length as the entire chromosome.

03:37 Stay true or false.

03:39 So here we have to state that whether the messenger rna is in the same length of the entire chromosome.

03:44 The answer for this question is false.

03:48 Okay.

03:48 This is because mrnas, okay, mri is aggravated form of messenger rna.

03:53 Are shorter than dna as the chromosome.

03:57 They are shorter than dna as the chromosome as the chromosome contains the entire code.

04:13 Okay...

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