Type of mutation in which a pyrimidine is substituted for a purine

TLS Online TPP Program

#Question id: 15785

#Unit 5. Developmental Biology

During the formation of induced pluripotent stem cell, what is the function of Sox2 and Oct4?

A. Established pluripotency and blocked differentiation.

B. Opened up chromatin

C. Activation of Nanog.

D. Promotes cell growth and proliferation

TLS Online TPP Program

#Question id: 1109

#Unit 4. Cell Communication and Cell Signaling

What role do phosphatases play in signal transduction pathways?

TLS Online TPP Program

#Question id: 11971

#Unit 7. System Physiology – Animal

Over-the-counter medications for acid reflux or heartburn block the production of stomach acid. Which of the following cells are directly affected by this medication?

TLS Online TPP Program

#Question id: 7763

#Unit 5. Developmental Biology

Two major sources of mutation are radiation and reactive oxygen species (ROS).The reactive oxygen species hypothesis for aging postulates that 

1) Senescence results from the accumulation of DNA, lipid, and protein damage inflicted by ROS of mitochondrial origin; and

2) Mitochondria of long-lived species should produce high ROS than do mitochondria of short-lived species.

3) the capacity of mitochondria to consume ROS might distinguish long-lived species from short-lived species, rather than differences in ROS generation. 

TLS Online TPP Program

#Question id: 10340

#Unit 6. System Physiology – Plant

There several charecteristics of nitrate reductase, which of the following properties of nitrate reductase is incorrect?