Balancing selection is a type of natural selection that balances two or more alleles in population allows maintaining genetic diversity. Which of the following allowed to this type of selection?

A- Heterozygote has the highest level of Fitness than normal homozygote

B- If rare phenotypes are favored over common phenotypes

C- Introduction of new allele in to a population by mutation and allowed to higher fitness in individuals

D- One homozygote has a highest level of fitness than heterozygote and another homozygote

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#Question id: 22967

#Unit 7. System Physiology – Animal

Which of the following statement are true about Osteoprotegerin?

a. A cytokine that promotes bone resorption.

b. A cytokine that inhibits bone resorption.

c. Produced by Osteoblasts

d. Produced by osteoclast

TLS Online TPP Program

#Question id: 22966

#Unit 7. System Physiology – Animal

Which cells contains receptor for PTH?

a. osteoclasts

b. osteoblasts

c. preosteoclasts

d. osteocytes

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#Question id: 22965

#Unit 7. System Physiology – Animal

Two osteoblast proteins responsible for osteoclast maturation; 

a. Receptor activator for nuclear factor κ-B ligand  

b. Macrophage colony-stimulating factor

c. Osteocalcin

d. Osteoprotegrin

TLS Online TPP Program

#Question id: 22964

#Unit 7. System Physiology – Animal

The receptor for PTH is coupled, via a 

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#Question id: 22963

#Unit 7. System Physiology – Animal

What are the 3 targets of parathyroid hormone?

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#Question id: 22962

#Unit 7. System Physiology – Animal

What is the relationship between calcium and PTH? 

a. When extracellular Ca2+ is decreased àCa2+ binding to the receptor àinhibits PTH secretion

b. When extracellular Ca2+ concentration is increased à Ca2+ binds to the receptor à activates phospholipase C àinhibits PTH secretion

c. When extracellular Ca2+ is decreased à Ca2+ doesn’t binds to the receptor àstimulates PTH secretion

d. When extracellular Ca2+ concentration is increased à Ca2+ binds to the receptor à activates phospholipase C àstimulates PTH secretion.