#Question id: 28302
#Unit 5. Developmental Biology
Which of the following process by which mammalian sperm become capable of fertilizing an egg or gaining capacity?
#Question id: 1523
#Unit 4. Cell Communication and Cell Signaling
Following statements are regarding to the apoptosis which is induced by trophic factors.
A. The presence of specific trophic factors (e.g., NGF) leads to activation of their cognate receptor tyrosine kinases (e.g., TrkA) and activation of the PKB pathway.
B. DNA damage or ultraviolet irradiation leads to induction of synthesis of the BH3-only Puma protein. Puma binds to Bak and Bax as well as to Bcl-2, allowing Bak and Bax to form oligomeric pores.
C. Removal of a cell from its substratum disrupts integrin signaling, leading to release of the BH3-only Bim protein from the cytoskeleton.
D. Binding of extracellular death signals, such as tumor necrosis factor and Fas ligand, to their receptors oligomerizes an associated protein (FADD), which in turn triggers the caspase cascade, leading to cell murder by apoptosis.
Which of the following pathway does not belong to the trophic factor inducing apoptotic pathway?
#Question id: 34087
#Unit 3. Fundamental Processes
#Question id: 1984
#Unit 4. Cell Communication and Cell Signaling
Which of the following is a pathway that would lead to the activation of cytotoxic T cells?
#Question id: 10270
#Unit 8. Inheritance Biology
Mendel crossed tall pea plants with dwarf ones. The F1 plants were all tall. When these F1 plants were selfed to produce F2 generation, he got a 3: 1 tall to dwarf ratio in the offspring. What is the probability that out of three plants (of F2 generation) picked up at random all three would be dwarf?