Describe the cortical reaction and explain its significance in the process of fertilization
What will be an ideal response?
ANSWER: In the cortical reaction, cortical granules just under the plasma membrane of the egg, fuse
with the membrane and release their contents to the outside by exocytosis. Enzymes
released from the cortical granules alter the egg's coat within minutes after fertilization, so
that no further sperm can attach and penetrate to the egg. Once this barrier, termed the slow
block to polyspermy, is set up, no further sperm can reach the egg plasma membrane in
any animal species.
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The water hole is between ____-cm to ____-cm
Fill in the blank(s) with correct word
Which of the following is not true of polymyxins?
A. They are narrow spectrum. B. They are toxic to kidneys. C. They target cell walls. D. They can be used to treat severe urinary tract infections caused by gram-negative bacilli. E. The source is Bacillus polymyxa.
Which feature(s) DID NOT contribute to the ability of humans to maintain an upright body position?
a. curvature of the spine b. size and position of the pelvis c. position of the foramen magnum d. alignment of the toes e. smaller canines
Gymnosperms are characterized by producing "naked seeds." Which of the following groups is NOT classified as a gymnosperm?
A. ginkgoes B. horsetails C. cycads D. conifers E. gnetophytes