Which of the following is incorrect about prophages?
A. Replicated with host DNA and passed on to progeny
B. Occur when temperate phages enter host cells
C. Cause lysis of host cells
D. Present when the virus is in lysogeny
E. Formed when viral DNA enters the bacterial chromosome
Answer: C
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What would be the consequence of deleting the late T4 genes?
A) The T4 genome would not be copied. B) T4 mRNA would not be produced. C) T4 capsid proteins would not be made. D) ATP would not be produced and the T4 genome would not be packaged into the capsid.
Seed plants are pollinated by:
A. butterflies B. birds C. bats D. beetles E. all of the other choices provided
1) Longest period of the cell cycle. 2) The division of the cytoplasm, which occurs at the end of mitosis and meiosis. 3) A phase in meiosis in which homologous pairs are separated from each other. 4) A phase in mitosis in which the chromosomes line up at the center of the cell. 5) The exchange of maternal and paternal forms of genes in prophase I. 6) A phase in mitotic division in which the sister chromatids are pulled apart by the spindle fibers. 7) A phase in mitotic division in which a nuclear membrane forms around each group of chromosomes at the two poles. 8) This cell possesses only a single set of chromosomes. 9) A specific segment of the chromosome's DNA that directs the synthesis of a single protein. 10) The method of reshuffling genes by randomly aligning them in metaphase I.
A) Interphase
B) Anaphase I
C) Metaphase
D) Crossing over
E) Anaphase
F) Telophase
G) Gene
H) Haploid
I) Cytokinesis
J) Independent assortment
If the embryos of a mating do not develop properly and die, thus preventing the offspring of two different species from continuing to reproduce, they are an example of
A. behavioral isolating mechanisms. B. mechanical isolating mechanisms. C. biochemical isolating mechanisms. D. hybrid inviability.