The crawling displayed by many embryonic cells in animals involves distinct events. Which of the following sequences places these events in correct order?
A) protrusion at the cell's leading edge, attachment of protrusion, pulling the cell forward, release and retraction of trailing edge
B) attachment of protrusion, pulling the cell forward, protrusion at the cell's leading edge, release and retraction of trailing edge
C) release and retraction of protrusion, protrusion at the cell's leading edge, attachment of trailing edge, pulling the cell forward
D) attachment of protrusion, protrusion at the cell's leading edge, pulling the cell forward, release and retraction of trailing edge
E) pulling the cell forward, release and retraction of protrusion, protrusion at the cell's leading edge, attachment of trailing edge
A) protrusion at the cell's leading edge, attachment of protrusion, pulling the cell forward, release and retraction of trailing edge
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The ancestral lung of fish has developed into a unique structure used for another important function. What is this function?
a. respiration b. buoyancy c. lymph circulation d. excretion of uric acid e. excretion of urea
In most species, all mRNA transcripts begin with _____
a. methionine b. a ribosome c. AUG d. the P site e. an anticodon
The source of a plant's new cells is a type of plant tissue called its
A. tracheid. B. meristem. C. guard cell. D. cortex. E. mesophyll.
This property of a microscope is defined as the minimum distance two points can be apart and still be distinguished as two separate points.
What will be an ideal response?