What is the cytoskeleton
What will be an ideal response?
Ans: Helps the cell maintain its shape and is also involved in movement.
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Which of the graphs above best represents the relationship between the intensity of directional selection and the genetic variation present within a population?
A) Graph A B) Graph B C) Graph C D) Graph D E) Graph E
This diagram illustrates the three suggested models of DNA replication. After describing the double-helix structure of DNA, Watson and Crick stated that this structure “... immediately suggests a possible copying mechanism for the genetic material.” Based on your knowledge of the structure of DNA, which of these three models were Watson and Crick most likely considering, and why?
a. the dispersive model, because it would take advantage of the mechanisms that create homologous recombination, a process with which Watson and Crick were familiar
b. the conservative model, because it is the only model that keeps DNA strands together, eliminating most potential sources of transcription errors during replication
c. the semi-conservative model, because each nucleotide can only bond to its complement, and each strand would rebuild a second strand from available nucleotides in the cell
d. the dispersive model, because it is the only model that would allow the DNA molecule to be reconstructed from end to end, copying a single nucleotide pair at a time.
Which of the following is an organelle that distinguishes between prokaryotic and eukaryotic cells?
a. the ribosomes b. the nucleus c. the cell wall d. the plasma membrane
Choose the true statement about the role of polyploidization in the evolution of plant genomes.
A. Crop plants rarely show evidence of polyploidization events. B. Genome downsizing following allopolyploidy usually affects the participating hybrids equally. C. Jumping of transposons is most common many generations after a polyploidization event. D. Genome downsizing following allopolyploidy results mainly from duplicate gene loss.