A cell in late anaphase of mitosis will have _____
A) no chromosomes in the center of the cell
B) chromosomes clustered at one end of the cell
C) individual chromatids beginning to separate from one another
D) chromosomes clustered tightly at the center
E) one large nuclear envelope
Answer: A
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The first line of plant defense against pathogen infection is(are) the:
A. cuticle. B. plasmodesmata. C. stomata. D. pathogens. E. cell walls.
A new mutation that arose in one copy of gene X in a somatic cell resulted in the formation of a tumor. Which of the following pieces of evidence best describes how the new mutation directly caused the tumor?
A) Protein X normally stimulates cell division, and the mutation created an overactive version of protein X B) Protein X normally activates a growth hormone receptor, and the mutation decreased the stability of protein X. C) Protein X normally prevents passage through the cell cycle, and the mutation created an overactive version of protein X. D) Protein X normally regulates gene expression, and the mutation created an underactive version of protein X that blocked the cell cycle.
What is the major difference in the termination stage of translation between prokaryotes and eukaryotes?
A. There are two termination factors in prokaryotes (RF1 and RF2) and only one factor in eukaryotes (eRF). B. There is no stop codon in prokaryotes while a stop codon is necessary in eukaryotes. C. Ribosomal subunits dissociate in prokaryotes, but remain intact in eukaryotes. D. There is one stop codon in prokaryotes (UAG) and three in eukaryotes (UAA, UAG, UGA). E. mRNA remains connected to the small ribosomal subunit (30S) in prokaryotes, but is released from the small ribosomal subunit (40S) in eukaryotes.
In gel electrophoresis, DNA molecules move toward the ________ electrode because they have an overall ________ charge.
A. negative; negative B. positive; positive C. negative; positive D. positive; negative E. negative and positive; neutral