Which statement is TRUE? a. A DNA template is read in the...

Which statement is TRUE? a. A DNA template is read in the 5'to 3' direction and a complementary nucleic acid molecule is synthesized from its 3' to 5' end. b. nucleic acids are synthesized in the 5' to 3' direction and polypeptides are made from their carboxyl to amino terminus. c. polypeptides are made from their amino to carboxyl terminus and nucleic acids are made from their 3' to their 5' end. d. A DNA template is read in the 3'to 5' direction and a complementary nucleic acid molecule is synthesized from its 5' to 3' end. Which nucleic acid molecule would be complementary to the sequence 5'-AGCCTAT-3'? a. more than one of the other answers b. 5'-ATAGGCT-3' c. 5'-UTUGGCT-3' d. 3'-TATCCGA-5' Which is NOT a significant difference between DNA and RNA nucleotides? a. RNA nucleotides have a hyroxyl group (-OH) attached to their 3'-carbon but DNA nucleotides do not. b. DNA nucleotides do not have a hydroxyl group (-OH) attached to their 2'-carbon but RNA nucleotides do. c. RNA nucleotides may contain the nitrogenous base uracil (U) but DNA nucleotides do not. d. DNA nucleotides may contain the nitrogenous base thymidine (T) but RNA nucleotides do not.

Transcript

00:01 So let's take a look at the statement right here.

00:03 The first question is about the dna synthesis and the polypeptide synthesis.

00:10 So let's take a look at the figure that i draw here.

00:13 The first one here is the dna template.

00:15 It's a five to three direction.

00:17 During dna synthesis, the dna polymer is bind to the template, and it reads the template from three to five directions, so from right to left.

00:27 And you can see that that makes the newly synthesized nucleic acid go from a five to three direction.

00:35 So the newly synthesized nucleotide can only be added on the three prime end.

00:42 So this is where i put the arrow.

00:43 So it only from five to three directions.

00:46 All right, so let's take a look at our statement right here.

00:50 A, dna template is read in the three to five direction.

00:55 And complementary nucleic acid molecule is synthesized from its three to five.

01:00 So according to our knowledge just now, both statements are wrong because the template is read from three to five direction and complementary strength is from five to three directions.

01:13 So obviously this is the wrong answer.

01:17 B, nucleic acid are synthesized in a three to five direction.

01:20 This is correct.

01:21 However, polypactite are made from carbon to coboxyl to amino group terminus.

01:28 And this is wrong.

01:30 Instead, polypeptide have two different ends.

01:34 The beginning end is called n terminus or amino terminus, and the downstream or end part is called combatsal group.

01:43 So a polypeptide are made from the n terminus to c terminus.

01:51 So this is also the wrong answer.

01:55 C.

01:55 Polypeptides are made from their n, amino to caboxyl terminus, this is correct.

02:01 However, nucleic acid are made from their three to five end.

02:05 So this part of the statement is wrong.

02:07 Again, wrong.

02:10 A dna template is read in a three to five erection, which is correct.

02:15 And a complementary nucleic acid molecule is synthesized from its five to three.

02:20 So both statements fit our description just now.

02:23 So that's a correct answer.

02:24 The next one.

02:25 What, which nucleic acid molecule would be the complementary to the sequence of 5 to 3 ag -c -c -t -a -t? now, there are two things about a complementary strength.

02:37 First of all, they are the opposite direction.

02:39 So whenever you have a 5, you're going to put down a 3.

02:42 Whenever you have a 3, you're going to put down as a 5 on the other side.

02:46 Now, another rule that we have to follow is a always pair with t nucleotide and g always pair it up with c nucleotide...

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