Which of the following statements about the cell cycle is correct?
A. During G2 phase, the cell grows and copies its chromosomes in preparation for cell division.
B. The cell cycle is a sequence of replications and divisions that produces a new cells.
C. In actively dividing cells, the S and G2 phases are collectively known as interphase.
D. When the S phase of the cell cycle is finished, a cell has twice as many chromatids as the number of chromosomes in the G1 phase.
E. The phases of the cell cycle are G1, S, and M phases.
Answer: D
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The first plants clearly evolved from an organism that, if it existed today, would be classified as a multicellular green ___________.
Fill in the blank(s) with the appropriate word(s).
Which structure can still develop normally in an embryo with mutations in both the SHOOTMERISTEMLESS (stm) gene and the HOBBIT gene?
A. root cap B. shoot apical meristem C. root apical meristem D. leaf primordia E. cotyledons Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about meristems? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Alternative or different forms of the same gene are called _____
a. homozygous b. chromatids c. alleles d. homologous e. karyotypes
All of the following are examples of noncompetitive inhibitors EXCEPT
A) lead. B) nerve gas. C) arsenic. D) mercury.