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TLS Online TPP Program

#Question id: 5078

A human blastomere is:

#Unit 5. Developmental Biology

  1. an embryonic cell that is smaller than the ovum

  2. an embryonic structure that includes a fluid-filled cavity

  3. that part of the acrosome that opens the egg's membrane

  4. a cell that contains a (degenerating) second polar body

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TLS Online TPP Program

#Question id: 20401

#Unit 3. Fundamental Processes

There were four rules of parity given by Erwin Chargaff 
1) Base A in one strand of the duplex is matched by (T) in the other strand, and base G in one strand of the duplex is matched by a complementary base (C) in the other strand
2) equal amounts of A and T, and equal amounts of C and G, in each single strand of the duplex. 
3) Purines in non-template strand applies more closely to Exons
4) GC content tends to be greater in exons than in introns
choose the correct option regarding rules 
TLS Online TPP Program

#Question id: 20400

#Unit 3. Fundamental Processes

There are four rules of parity given by Erwin Chargaff which of the following applies more closely to introns than exons
TLS Online TPP Program

#Question id: 4351

#Unit 3. Fundamental Processes

A Cycle of Peptide-Bond Formation Consumes
TLS Online TPP Program

#Question id: 4301

#Unit 3. Fundamental Processes

Which of the following proteins prevents eukaryotic mRNAs from being recruited to the ribosome prior to egg fertilization
TLS Online TPP Program

#Question id: 4300

#Unit 3. Fundamental Processes

Find correct order of cotranslational translocation in endoplasmic reticulum

A. Transfer of the nascent polypeptide–ribosome to the translocon leads to opening of this

translocation channel to admit the growing polypeptide adjacent to the signal sequence, which is transferred to a hydrophobic binding site next to the central pore. Both the SRP and SRP receptor, once dissociated from the translocon, hydrolyze their bound GTP and then are ready to initiate the insertion of another polypeptide chain.

B. As the polypeptide chain elongates, it passes through the translocon channel into the ER lumen, where the signal sequence is cleaved by signal peptidase and is rapidly degraded.

C. The SRP and the nascent polypeptide chain–ribosome complex bind to the SRP receptor in

the ER membrane. This interaction is strengthened by the binding of GTP to both the SRP and its receptor.

D. The ER signal sequence emerges from the ribosome; it is bound by a signal recognition particle (SRP).
TLS Online TPP Program

#Question id: 4299

#Unit 3. Fundamental Processes

Lactate dehydrogenase (LDH) can exist as various tetrameric isozymes. Extracts from different rat tissues were run on a nondenaturing polyacrylamide gel and stained for LDH activity, as shown below. Standard tetramers of M subunits (M4) and H subunits (H4) were run alongside the tissue extracts. Which of the following is the subunit composition of the isozyme running at position 2 ?