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TLS Online TPP Program

#Question id: 5669

What is the reproductive difference between sea urchins and mammals is?

#Unit 5. Developmental Biology

  1. The sea urchin egg completes meiosis prior to fertilization, but meiosis in mammals is completed after fertilization

  2. Sea urchin eggs and sperm are of equal size, but human eggs are much bigger than mammal’s sperm

  3. Sea urchins, but not mammals, have a need to block polyspermy, because only in sea urchins can there be more than one source of sperm to fertilize the eggs

  4. Sea urchin zygotes get their mitochondria from the sperm, but mammals zygote get their mitochondria from the egg.

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TLS Online TPP Program

#Question id: 12980

#Unit 10. Ecological Principles

The following questions refer to Figure which depicts the age structure of three populations.

Which population is in the process of decreasing?

TLS Online TPP Program

#Question id: 4445

#Unit 3. Fundamental Processes

The active site, which is made up of RPB1 and RPB2, from both these subunits, is found at the base of the pincers within a region called the “active center cleft” . The active site works according to the two-metal ion catalytic mechanism for nucleotide addition proposed for all types of polymerase;
TLS Online TPP Program

#Question id: 18230

#Unit 13. Methods in Biology

Although PCR and replication show resemblances, but the basic difference is
TLS Online TPP Program

#Question id: 31066

#Unit 2. Cellular Organization

G1 CDKs activate members of a small family of related transcription factors, referred to collectively as: 
TLS Online TPP Program

#Question id: 27419

#Unit 1. Molecules and their Interaction Relevant to Biology

The distribution of lipids in the membranes of a typical cell Each membrane has its own characteristic composition, and the two monolayers of a given membrane may differ in composition hence choose which of the following is incorrect 
Note = OML = outer mono layer, IML = inner mono layer