#Question id: 14693
#Unit 13. Methods in Biology
#Question id: 11732
#Unit 6. System Physiology – Plant
Cytokinins are defined as compounds that have biological
activities similar to those of trans-zeatin. These activities include the
ability to do the following:
a) Induce cell division in callus cells in the presence of
an auxin
b) Promote bud or root formation from callus cultures when
in the appropriate molar ratios to auxin
c) promote senescence of leaves
d) Promote expansion of dicot cotyledons
Which one of the following activities are incorrect?
#Question id: 8716
#Unit 9. Diversity of Life Forms
The most important feature that permits a gene to act as a molecular clock is ________.
#Question id: 5672
#Unit 5. Developmental Biology
Following statements are regarding to recognition of sperm by mammalian zona pellucida.
A. Sperm that have undergone the acrosome reaction bind directly to zona protein ZP2 and begin making a channel toward the oocyte.
B. Sperm with an intact acrosome bind to ZP2; they undergo the acrosome reaction on the zona pellucida and then transfer their binding to ZP3.
C. When a sperm reaches the oocyte and fuses with it, the cortical granules release proteins that digest portions of ZP2 and ZP3, making them nonfunctional and prevent polyspermy.
D. When a sperm reaches the oocyte and fuses with it, the cortical granules release proteins that digest ZP3 only, not ZP2 because ZP2 involve in the process of slow block to polyspermy.
Which of the above statements are correct?
#Question id: 4905
#Unit 8. Inheritance Biology
Which of the correct feature of genetic material effect?