In a cell you see 23 pairs of chromosomes (homologous chromosomes) forming a tetrad. Crossing over is occurring. What phase of meiosis is this?
A. Prophase I (crossing over ONLY occurs in prophase I)
B. Prophase II
C. Metaphase II
D. Telophase II
Ans: A. Prophase I (crossing over ONLY occurs in prophase I)
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Which of the following is found in many tetrapods but not in fish?
A) extensive parental care B) asexual reproduction C) internal fertilization D) viviparity E) production of amniotic eggs
Codons that serve as "stop" signals for translation are recognized by
A. tRNA. B. release factors. C. anticodons. D. translation terminators. E. aminoacyl-tRNA synthetases
Which of the following factors is LEAST likely to attract pollinators to a flower?
A. the amount of nectar B. odor C. color of the flower in visible light D. color of the flower in UV light E. taste of the ovules
Which of the following is correct?
1.dragonfly and bat wings are homologous
2.dragonfly, bat and bird wings are homologous
3.dragonfly and bat wings are an example of divergent evolution
4.none of these