Which of the following precede the re-formation of the nuclear envelope during M phase in animal cells?
(a) assembly of the contractile ring
(b) decondensation of chromosomes
(c) reassembly of the nuclear lamina
(d) transcription of nuclear genes
(a) The contractile ring in an animal cell begins to assemble in anaphase. The chromosomes do not decondense [choice (b)], the lamina does not re-form [choice (c)], and transcription does not begin [choice (d)] until the formation of the nuclear envelope is complete and nuclear proteins have been imported through the nuclear pores.
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Acetylation is irreversible
Indicate whether the statement is true or false.
Sympatric speciation through polyploidy has been a frequent phenomenon in the evolution of
a. insects. b. mammals. c. bacteria. d. plants. e. fish.
In Figure 33-1, the region that is composed of secondary xylem is:
a. 1.
b. 2.
c. 3.
d. 4.
e. 5.
Which of the following structures is found in the monocot seed but not in the eudicot seed?
A. pericarp B. radicle C. cotyledon D. plumule