Growth hormone secretion is regulated by negative feedback, three feedback loops including both long and short loops are involved,

a.  GHRH inhibits its own secretion from the hypothalamus via an ultrashort-loop feedback.

b. Somatomedins, which are by-products of the growth hormone action on target tissues, inhibit secretion of growth hormone by the anterior pituitary.

c. Both growth hormone and somatomedins stimulate the secretion of somatostatin by the hypothalamus.

d. SRIF is also secreted by the hypothalmus and acts on the somatotrophs to stimulate growth hormone secretion.

Which one of the following represents all correct statements?

TLS Online TPP Program

#Question id: 32314

#Unit 2. Cellular Organization

In cells expressing mutant versions of Sar1 or ARF that cannot hydrolyze GTP, what would be the result?

a. Vesicle coats do not form and vesicle buds pinch off.

b. The mutant proteins cannot trigger disassembly of the coat all available coat subunits eventually become permanently.

c. Unable to fuse with target membranes.

d. Blocking of coat disassembly.

TLS Online TPP Program

#Question id: 32315

#Unit 2. Cellular Organization

What triggers the release of the LDL particle from its receptor in the endosome?

TLS Online TPP Program

#Question id: 32316

#Unit 2. Cellular Organization

What phenomenon occurs when the rate of actin subunit addition is faster than nucleotide hydrolysis at the plus end but slower than nucleotide hydrolysis at the minus end?

TLS Online TPP Program

#Question id: 32317

#Unit 2. Cellular Organization

What type of interaction occurs between the β-propeller domain and the LDL-binding domain at low pH?

TLS Online TPP Program

#Question id: 32318

#Unit 1. Molecules and their Interaction Relevant to Biology

If fertilized, the egg is transformed from a single cell to a complex organism. Discuss this irreversible process in terms of the thermodynamic changes in the system as

TLS Online TPP Program

#Question id: 32319

#Unit 1. Molecules and their Interaction Relevant to Biology

The standard free-energy change for given reactions, using the equilibrium constants given for the reactions at 25 °C and pH 7.0, will be