During metaphase,
A. heterochromatin is converted to euchromatin.
B. chromosomes are about 30 nm wide.
C. chromosomes are much shorter than they were in interphase.
D. chromosomes undergo gene transcription.
E. the "beads on a string" structure is visible.
C. chromosomes are much shorter than they were in interphase.
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At the beginning of prophase I, there are _____ chromosomes in the germ cell that will develop into a human sperm
cell.
a. 23 b. 92 c. 46 d. half as many (as compared to somatic cell) e. twice as many (as compared to mature sperm)
What is the function of glial cells?
A) They carry messages. B) They protect and cushion the brain. C) They support neurons by supplying nutrients. D) They move waste products out of the brain.
You attempt deletion mapping of a part of the promoter region of a particular gene. You remove a short sequence of nucleotides. Once the altered DNA is transfected into cells, the cells are able to transcribe the transfected DNA in a normal fashion. What do you conclude?
a) The deleted sequence has a moderate level of importance in promoting transcription. b) The sequence that was removed is not an essential part of the promoter. c) The sequence that was removed is an essential part of the promoter. d) The sequence that was deleted is an important determinant of the ability to transcribe the gene.
In a __________, water, nitrogen, or carbon moves from the air, through organisms, then back to the environment.
Fill in the blank(s) with the appropriate word(s).