In order for a cell to crawl, it must produce a protrusion at the front of the cell (leading edge). One type of protrusion is a thin sheet called a(n) ________; another is a pointed structure called a(n) ________.
Fill in the blank(s) with the appropriate word(s).
lamellipodium; filopodium
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How can foreign DNA of greater than 300 kbp be inserted and stably maintained in BAC vectors?
What will be an ideal response?
Which statement about the megasporocyte is true?
a. It undergoes meiosis to produce three haploid cells. b. It is a diploid cell located within an ovule. c. It divides mitotically to form a male gametophyte. d. It plays an important role in cross-pollination. e. It will give rise to the generative cell.
The transition zone between biomes is called a(n) ecotone. Indicate whether the statement is true or false
A paraphyletic group contains
A. a common ancestor and all of its descendants. B. groups of species with different common ancestors. C. every species ever derived from a common ancestor. D. a common ancestor but not all of its descendants. E. a common ancestor and all of its descendants but not the most recent common ancestor.