The ability to taste the chemical phenylthiocarbamide is an autosomal dominant phenotype, and the inability to taste it is recessive. If a taster woman with a nontaster father marries a taster man who in a previous marriage had a nontaster daughter. What is the probability that their first child will be tasters’ girl?

TLS Online TPP Program

#Question id: 2791

#Unit 2. Cellular Organization

In mammals, X-chromosome inactivation

TLS Online TPP Program

#Question id: 5761

#Unit 8. Inheritance Biology

E. coli cells were spread on an agar plate, producing 1000 colonies.  The colonies are replica plated on two agar plates containing the antibiotic kanamycin and one agar plate without antibiotics.  All of the colonies are able to grow on the agar plate without antibiotic but only 4 colonies are able to grow on each of the agar plates containing kanamycin.  You notice that the four colonies that grew on each of the kanamycin containing plates are in the exact same position.  This demonstrates

TLS Online TPP Program

#Question id: 2064

#Unit 2. Cellular Organization

What kinds of molecules pass through a cell membrane most easily?

TLS Online TPP Program

#Question id: 26844

#Unit 10. Ecological Principles

Researcher study the diversity of 2 communities, following is relative abundance of each species at different community? ( ln .5 = -0.69  , ln .25= -1.38  , ln .12= -2.12)

 What is value of Shannon index of community A and community B respectively?

TLS Online TPP Program

#Question id: 12483

#Unit 2. Cellular Organization

ATM and ATR are protein kinases that become activated following specific types of DNA damage. 

A. ATM becomes activated in response to double‐strand breaks, which are detected by the MRN protein complex. 

B. ATR becomes activated by protein‐coated ssDNA that forms when replication forks become stalled or the DNA is being repaired after various types of damage.

C. ATR phosphorylates and activates the checkpoint kinase Chk2, which phosphorylates p53. D. ATM phosphorylates and activates the checkpoint kinase Chk1, which phosphorylates and inactivates the phosphatase Cdc25.

Which of the following combination is incorrect?