During the plant life cycle, haploid spores are produced by meiosis in structure called _______, located at branched tips.
A. Microphylls
B. Sporangia
C. Sporopollenins
D. Megaphylls
E. Zygotes
Answer: B. Sporangia
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Some botanists consider the stoneworts to be a link between the higher plants and the algae. As you will learn in future exercises, higher plants, such as the mosses, have both haploid and diploid stages that are multicellular.
(a) Describe the multicellular organism in the charophytes. (b) Is this organism haploid or diploid? (c) Is the zygote haploid or diploid? (d) Is the zygote unicellular or multicellular?
A researcher wants to mutagenize an organism. He is not in need of a large number of mutants but is more concerned with being able to find and then to amplify the mutated sequence. Which of the following would therefore be more useful?
A) ionizing radiation B) UV radiation C) transposon insertion D) a chemical mutagen E) search for spontaneous mutant
In a replicating DNA molecule, the region in which parental strands are separating and new strands are being synthesized is called a:
A. Okazaki fragment. B. primer. C. replication fork. D. heteroduplex.
All the chemical reactions that occur in a cell are called
What will be an ideal response?