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TLS Online TPP Program

#Question id: 7254

Following statements regarding to the micromeres specification and regulatory input  in sea urchin embryo. Which of the following statement is correct?

#Unit 5. Developmental Biology
  1. OTX is a general transcription factor, and β-catenin from the maternal cytoplasm is concentrated at the vegetal pole of the egg. These transcriptional regulators are inherited by the macromeres and activate the Pmar1 gene.
  2. Pmar1 encodes a repressor of HesC, which in turn encodes activator of several genes involved in micromere specification.
  3. In the veg2 cells, Pmar1 is not activated and the HesC gene product shuts down the non-skeletogenic genes.
  4. As soon as the micromeres form, maternal β-catenin and Otx activate the Blimp1 gene, whose product activates the Wnt8 gene. Wnt8 protein is then received by the same micromeres that made it (i.e., autocrine regulation), activating the micromeres’ own genes for β-catenin.
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TLS Online TPP Program

#Question id: 3023

#Unit 2. Cellular Organization

During which phase of the bacterial growth curve does a bacterial population become much more resistant to harmful conditions?
TLS Online TPP Program

#Question id: 3024

#Unit 2. Cellular Organization

In a rapidly multiplying bacterial population, cell numbers increase
TLS Online TPP Program

#Question id: 3025

#Unit 2. Cellular Organization

Penicillin is an antibiotic that inhibits enzymes from catalyzing the synthesis of peptidoglycan, so which prokaryotes should be most vulnerable to inhibition by penicillin?
TLS Online TPP Program

#Question id: 3026

#Unit 2. Cellular Organization

Not present in all bacteria, this structure enables those that possess it to germinate after exposure to harsh conditions, such as boiling:
TLS Online TPP Program

#Question id: 3027

#Unit 2. Cellular Organization

Which of the following contains a copy of the chromosome, along with a small amount of dehydrated cytoplasm, within a tough wall?
TLS Online TPP Program

#Question id: 3028

#Unit 2. Cellular Organization

Endospores can be stained with