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Olegator [25]
3 years ago
12

Regarding epitopes for BCRs and/or for TCRs, indicate whether each statement below (a-e) is true. (5 pts) If the statement is on

ly true for epitopes for BCRs--write (B) If the statement is only true for epitopes for TCRs--write (T) If the statement is true for epitopes for both BCRs and TCR--write (BT) If the statement is NOT true for either epitopes for BCRs or TCR--write (N) a. epitopes may consist of non-sequential amino acids b. epitopes are often from the interior of an antigen c. epitopes can be present in immunogens d. epitope binding to the antigen receptor obeys the 12/23 rule e. multiple identical epitopes may be present in a single antigen
Biology
1 answer:
loris [4]3 years ago
5 0

Answer:

a-B

b-N

c-BT

d-BT

e-BT

Explanation:

a. epitopes may consist of non-sequential amino acids --------->  B (is only true for epitopes for BCRs)

b. epitopes are often from the interior of an antigen -------------> N (IS ONLY TRUE FOR EPITOPES FOR TCR)

c. epitopes can be present in immunogens  ------------------> BT (True for both TCR and BCRs )

d. epitope binding to the antigen receptor obeys the 12/23 rule -------------> BT (True for both TCR and BCRs )

e. multiple identical epitopes may be present in a single antigen --------------> BT (True for both TCR and BCRs )

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What three processes lead to variation among offspring that have the same two parents?
beks73 [17]

Explanation:

Genetic variation in offspring during sexual reproduction is caused by

  • crossing over
  • independent assortment
  • randomized fertilization

Further Explanation:

All the genetic information within the eukaryotic cell is stored within the nucleus as helical DNA. This DNA is tightly wound around histones as chromosomes. To produce daughter cells during cell division, the chromosomes (total number of chromosomes (2n)) are copied before the cell splits into two daughter cells. This process is known as mitosis, and occurs in cell division and growth processes. Two new nuclei are formed, along with identical cells. These are the same as the parent cell and the chromosome number (2n) is maintained.

Conversely in meiosis, the number of chromosomes (2n) is halved through meiotic divisions, producing 4 (n) germ cells (sperm or eggs), each containing half the number of chromosomes as its parent cell.

  • crossing over:  the exchange of segments of chromosome, between non-sister homologous or similar chromatids crossing over happens at chiasmata, the point where non-sister chromosomes are joined.
  • independent assortment in metaphase I of meiosis: chromosomes align independently and genes segregate independently into new combinations ...in humans 2n, n = 23, 8 million combinations of chromosomes possible
  • randomized fertilization: sperm cells fertilize an ovum to form a zygote. This occurs randomly by chance, to result in a complete set of chromosomes 2n, that is a novel combination of half each parent's number of chromosomes

Learn more about mitosis at brainly.com/question/4303192

Learn more about transcription at brainly.com/question/11339456

Learn more about DNA and RNA at brainly.com/question/2416343?source=aid8411316

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9 0
3 years ago
Which of the following is true regarding eukaryotic chromosomes?
QveST [7]

Answer:

choice B

Explanation:

8 0
4 years ago
Which two characteristics do organisms in kingdoms Plantae and Animalia
Alexxandr [17]
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8 0
3 years ago
4. A polypeptide has the following amino acid sequence: Met-Ser-Pro-Arg-Leu-Glu-Gly In the mutant below, indicate the type of mu
MatroZZZ [7]

Answer:

4. c. Deletion/ frameshift mutation

5. a. Tyr Tyr Asp Ser Gly

6. A frameshift occurred which altered the identity of the amino acids following the initiator 6. methionine, but not the length of protein Q.

Explanation:

4)

A single base pair at the first position of the Arg codon i.e. CGA has been deleted. Due to the deletion, the reading frame has shifted one nucleotide backwards, altering the amino acid sequence of the protein.

5)

The genomic DNA sequence is 5'-ATG ATA CTA AGG CCC-3'. Therefore, the complementary mRNA will be 5'-UAC UAU GAU UCC GGG-3'. According to the genetic code, this mRNA sequence encodes the following amino acid sequence: Tyr Tyr Asp Ser Gly

6)

The wild type DNA sequence is:

5'-ACUGUAAUGGAGUCAGAUGAUGCAUUAAGGAGAAAUUGAAAUAAA-3'

The mutant i.e. mRNA with the added G will be

5' ACUGUAAUGGGAGUCAGAUGAUGCAUUAAGGAGAAAUUGAAAUAAA-3'  

This is a single base pair insertion and frameshift mutation that shifts the reading frame one base pair forwards. The codon that was originally GAG coding for glutamic acid (Glu) gets converted to GGA that codes for glycine. Therefore, the amino acid sequence has been altered but the polypeptide chain will still have 13 amino acids.

6 0
3 years ago
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