Practice Questions

TLS Online TPP Program

#Question id: 802

A single-stranded DNA molecule contains 40 nucleotides with equal amounts of A, C, G, and T. This DNA strand can combine with a complementary DNA strand to form a double-stranded DNA molecule. Which is a possible sequence and structure for this DNA molecule?

#Unit 1. Molecules and their Interaction Relevant to Biology

If the single-stranded molecule has the sequence 5’-(ATGC)10, then its double- stranded form could assume a Z-DNA structure.
If the single-stranded molecule has the sequence 5’-(GATC)10, then its double-stranded form could assume an H-DNA structure.
If the single-stranded molecule has the sequence 5’-(CTGA)10, then its double-stranded form could assume a hairpin structure.
If the single-stranded molecule has the sequence 5’-(TGAC)10, then its double-stranded form could assume a cruciform structure.

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TLS Online TPP Program

#Question id: 22961

#Unit 7. System Physiology – Animal

What is the receptor class of the calcium-sensing receptors in the parathyroid gland?

TLS Online TPP Program

#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.

TLS Online TPP Program

#Question id: 22963

#Unit 7. System Physiology – Animal

What are the 3 targets of parathyroid hormone?

TLS Online TPP Program

#Question id: 22964

#Unit 7. System Physiology – Animal

The receptor for PTH is coupled, via a

TLS Online TPP Program

#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

d. Osteoprotegrin

TLS Online TPP Program

#Question id: 22966

#Unit 7. System Physiology – Animal

Which cells contains receptor for PTH?

c. preosteoclasts