#Question id: 28241
#Unit 5. Developmental Biology
regulation occurs through a factors that keep a stem cell in its quiescent or proliferative state, as well as promoting maturation of daughter cells toward a particular fate, these type of regulation is called as___
#Question id: 15815
#Unit 8. Inheritance Biology
You and your lab partner have isolated 20 new mutant yeast strains that are defective in synthesis of threonine, an amino acid. These Thr- mutants do not grow on minimal medium, but they do grow on minimal medium supplemented with threonine. Ten of your Thr- mutants (numbered 1 through 10) were isolated in a strain of mating type a (MAT a). The other 10 Thrmutants (numbered 11 through 20) were isolated in a strain of mating type α (MAT α). You and your lab partner cross each of the MAT a strains to each of the MAT α strains, and you include crosses to the appropriate wild-type strains. Your experimental observations are shown in the table below, where (-) indicates diploids that did not grow on minimal medium and (+) indicates diploids that did grow on minimal medium.
Which mutations are dominant?
#Question id: 2990
#Unit 2. Cellular Organization
Mitotic CDK complexes are maintained in an inactive state through inhibitory phosphorylation of the CDK subunit. Two highly conserved tyrosine and threonine residues in mammalian CDKs are subject to regulated phosphorylation.
|
Gene |
Mutant phenotypes |
|
A. Wee1 |
i. the cell does not divide but continues to grow |
|
B. CAK kinase |
ii. mitotic cyclins are inactivated |
|
C. cdc25 phosphatase |
iii. premature entry into mitosis |
The following table enlists genes and phenotypes observed on mutation of these genes but not correctly matched. Which one of the following combinations is correctly matched ?
#Question id: 27511
#Unit 2. Cellular Organization
Which of the following is true when a Intercalation of ethidium ion into the DNA takes place
a. It unwind the two base pair by 260
b. Reduces the normal rotation per base pair from 360 to 100
c. Increases the normal rotation per base pair from 100 to 360
d. It first removes the negative supercoils and then introduces positive supercoils
#Question id: 1850
#Unit 4. Cell Communication and Cell Signaling
What is a potential disadvantage of immunological protection using passive transfer of horse globulins?