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USMLE Biochemistry Videos & Books

टेलीग्राम चैनल का लोगो biochemistryvideos2021 — USMLE Biochemistry Videos & Books U
टेलीग्राम चैनल का लोगो biochemistryvideos2021 — USMLE Biochemistry Videos & Books
चैनल का पता: @biochemistryvideos2021
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नवीनतम संदेश

2022-08-31 21:52:01 Educational objective: DNA replication occurs in the 5'--+3' direction on both strands. In contrast to the continuous synthesis of the leading strand, lagging strand synthesis occurs discontinuously and is composed of short stretches of RNA primer plus newly synthesized DNA segments (Okazaki fragments). As a result, lagging strand synthesis requires the repetitive action of DNA primase and DNA ligase.
35 views18:52
ओपन / कमेंट
2022-08-31 08:52:02
Which of the following processes will differ the most between the 2 daughter strands formed at each replication fork?
Anonymous Quiz
0%
A.Enzymatic function of DNA helicase
17%
B. Interaction with single-stranded DNA-binding proteins
33%
C.Joining of DNA fragments by ligase
33%
D.Proofreading of the newly synthesized DNA
17%
E. Relief of supercoils by topoisomerase
12 voters141 views05:52
ओपन / कमेंट
2022-08-31 08:51:01 A 65-year-old woman with chronic obstructive pulmonary disease and type II diabetes mellitus comes to the emergency department due to profound fevers and malaise. After initial evaluation, she is hospitalized for septicemia. Blood cultures plated on lactose-containing media grow rapidly dividing gram-negative bacteria. Replication of these microbial cells requires synthesis of two daughter strands of DNA using the parent strands as templates.
137 views05:51
ओपन / कमेंट
2022-08-30 21:51:01 Educational objective: Nucleosomes are composed of DNA wrapped around a core of 8 histone proteins (2 molecules each of H2A, H2B, H3, and H4). H1 histone is located outside of this histone core and helps package nucleosomes into more compact structures by binding and linking the DNA between adjacent nucleosomes.
170 views18:51
ओपन / कमेंट
2022-08-30 08:51:02
Which of the following proteins is most likely found outside of this core and helps promote chromatin compaction?
Anonymous Quiz
55%
A.Histone H1
18%
B. Histone H3
9%
C.Histone H4
0%
D.snRNP
18%
E. Topoisomerase II
0%
F. Ubiquitin
11 voters87 views05:51
ओपन / कमेंट
2022-08-30 08:50:29 Electron microscopy of a eukaryotic cell during interphase of the cell cycle shows 10-nm thick chromatin fibers with a "beads on a string" appearance. These chromatin fibers are extracted and treated with an endonuclease, which preferentially cleaves the "string" portions of the chromatin. Further evaluation of the "beads" reveals that they are composed of DNA wrapped around a core of proteins.
85 views05:50
ओपन / कमेंट
2022-08-29 22:50:32 Educational objective: Alternative splicing is a process by which a single gene can code for various unique proteins by selectively including or excluding different DNA coding regions (exons) into mature mRNA.
126 views19:50
ओपन / कमेंट
2022-08-29 22:35:02 https://t.me/studentdoctor
123 views19:35
ओपन / कमेंट
2022-08-29 08:50:20
Which of the following is the most likely explanation for the formation of altered Fas proteins in these cancer cells?
Anonymous Quiz
38%
A.Alternative splicing
0%
B. Defective polyadenylation
38%
C.DNA methylation
15%
D.Polycistronic mRNA
8%
E. Protein ubiquitination
13 voters182 views05:50
ओपन / कमेंट
2022-08-29 08:49:01 A researcher is studying the Fas receptor (FasR), a protein widely expressed on cell surfaces. The signaling cascade of programmed cell death is initiated when FasR binds to its ligand (Fasl), which is expressed on cytotoxic T cells. In an experiment, cancer cells that escaped elimination by the immune system were found to contain soluble Fas proteins that did not promote apoptosis. The soluble Fas proteins were shorter and lacked the transmembrane domain. DNA analysis of these cells revealed no FAS gene mutations.
165 views05:49
ओपन / कमेंट