#Question id: 1517
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to cell death and its regulation.
A. In mammals, apoptosis can be triggered by oligomerization of Bax or Bak proteins in the outer mitochondrial membrane, leading to efflux of cytochrome c and SMAC/DIABLO proteins into the cytosol; these proteins then promote caspase activation and cell death.
B. Direct interactions between pro-apoptotic and anti-apoptotic proteins lead to cell death in the absence of trophic factors.
C. Direct interactions between pro-apoptotic and anti-apoptotic proteins lead to cell death in the presence of trophic factors.
D. Once activated, apoptotic proteases called caspases cleave specific intracellular substrates, leading to the demise of a cell.
Which of the following statements are correct?
#Question id: 9585
#Unit 6. System Physiology – Plant
In light reaction the reaction centre of PSII receives electron from water molecules by splitting into oxygen, If 5 oxygen molecules evolved per 50 quanta was
absorbed then what is the quantum yield?
#Question id: 4935
#Unit 11. Evolution and Behavior
Which gas was least abundant in Earthʹs early atmosphere, prior to 2 billion years ago?
#Question id: 5678
#Unit 5. Developmental Biology
Following process and their mechanism during fertilization in mammals.
a. Rheotaxis |
i.A sensing mechanism in which, the oocyte and its accompanying cumulus cells secrete molecules that attract capacitated sperm toward the egg during the last stages of sperm migration |
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b. Chemotaxis |
ii.It is a transient event, and sperm are given a relatively brief window of competence during which they can successfully fertilize the egg. |
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c. Capacitation |
iii.it is the ability to sense temperature difference and preferentially swim from cooler to warmer sites is found only in capacitated sperm. |
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d. Thermotaxis |
iv.Sperm receive long-distance directional cues from the flow of liquid from the oviduct to the uterus and they will migrate against the direction of the flow—using CatSper calcium channels to sense calcium influx and monitor the direction of the current |
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Which of the following option is correct?
#Question id: 2124
#Unit 2. Cellular Organization
An integral membrane protein can be extracted with: