What is the term for a culture made from one isolated colony?
A. Pure
B. Mixed
C. Axenic
D. Both axenic and mixed are correct.
E. Both axenic and pure are correct.
Answer: E
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Scientists have found that the lifetimes of mRNAs coding for pair-rule regulatory elements in Drosophila embryos may last only a few minutes. What does this suggest about the overall developmental plan of an animal body?
A) The role of mRNAs is less important than the position of genes in chromosomes. B) Homeotic genes have greater impact in forming an embryo than mRNA from pair-rule genes. C) Building an animal body requires a sequence of precisely timed steps. D) Timing of pair-rule sequence determination is not as important as spatial signaling.
Proteins and nucleic acids absorb light maximally at 260 nm; hence, proteins protect cells from UV effects
Indicate whether the statement is true or false.
Which of the following is not one of the four tissue types?
A. muscle B. nervous C. epithelial D. connective E. squamal
Which sequence of stages in mitosis is correct?
A. prophase, anaphase, prometaphase, metaphase, telophase B. prophase, telophase, anaphase, prometaphase, metaphase C. prophase, prometaphase, metaphase, anaphase, telophase D. telophase, anaphase, prophase, prometaphase, metaphase E. anaphase, prometaphase, metaphase, prophase, telophase