#Question id: 12097
#Unit 10. Ecological Principles
The herbaceous plant Achillea lanulosa is widespread in the Northern Hemisphere. Phenotypic variation in the species has been extensively studied along an altitudinal gradient from sea level to over 3,000 meters. In California there is conspicuous variation in height; alpine plants are only several centimeters tall while those in the San Joaquin Valley may reach a height of 1.8 meters. Adaptation to different local environments also results in variation in physiological processes such as photosynthetic rate, resistance to cold, and the timing of dormancy.
Which of the following methods would be best to determine whether the phenotypic variation in Achillea lanulosa is due to genotypic variation?
#Question id: 5677
#Unit 5. Developmental Biology
During acrosome reaction, after binding with the egg many sperm membrane proteins are activated. Which of the following membrane protein is not activated?
#Question id: 7195
#Unit 5. Developmental Biology
Given below are some of the statements regarding toll signalling pathway in drosophila.
A. Dorsal protein is a transcription factor with homology to the Rel/nuclear factor kappa B (NFκB) family of vertebrate transcription factors, which are involved in regulation of gene expression in vertebrate immune responses.
B. Toll signalling pathway is also used in the adult fly in defense against infection.
C. In the Drosophila embryonic Toll pathway Dorsal is held inactive in the nucleus by the protein Cactus.
D. The ligand for Toll is a fragment of the protein Easter, which is generated in the ventral vitelline space by the protease Spatzle.
E. When Toll is activated by binding the Spätzle fragment, its cytoplasmic domain binds a complex of the adaptor proteins dMyD88 and Tube. Tube interacts with, and activates, the protein kinase Pelle.
F. Activation of Pelle leads to the dephosphorylation of Cactus. This releases Dorsal, which is then free to enter a nucleus.
Choose the most appropriate combination of correct statements:
#Question id: 10536
#Unit 6. System Physiology – Plant
Hormonal interactions contribute to plant–insect herbivore interactions such as— ethylene, salicylic acid, and jasmonic acid. In particular, ethylene appears to play an important role in this context, what will be the effect of ethylene when is applied alone and when is applied with other amino acids?
a) ethylene applied together with JA it seems to reduces defense responses
b) Ethylene appears to applied alone to plants, ethylene has little effect on defense-related gene activation
c) when ethylene applied together with JA it seems to enhance JA responses or defense responses are significantly increased
d) Ethylene appears to applied alone to plants, ethylene has more effect on defense-related gene activation
Which of the following combination is correct about ethylene effects?
#Question id: 1400
#Unit 4. Cell Communication and Cell Signaling
Which property is shared by malignant tumor cells and transformed cells in culture?
a. reduced growth factor requirement b. attachment-dependent growth
c. loss of actin microfilaments d. altered morphology