The nematode Caenorhabditis elegans _____
A) is composed of about 1000 cells, in which the developmental origin of each cell has been mapped
B) has only a single chromosome, which has been fully sequenced
C) has about 1000 genes, each of which has been fully sequenced
D) uniquely, among animals, utilizes programmed cell death during normal development
A
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After mutagenesis and screening, you have found a mutant that is able to grow in soil with high salt content. Chemical analysis showed that this plant has a decreased amount of Na+ relative to normal plants
What kind of mutation do you predict this plant contains? A) mutation in the plasma membrane sodium channel B) mutation in the metallothioneins C) mutation in the tonoplast sodium channel D) mutation in the tonoplast antiporter
The only diploid cell of the life cycle of basidiomycetes is produced within the basidium by
A. mitosis. B. meiosis. C. karyogamy. D. ascus bursting. E. budding.
What helps regulate the movement of carbon dioxide into and out of a leaf?
A) guard cells B) root hairs C) sieve plates D) xylem
If all available enzyme molecules are binding substrate and converting it to product as rapidly as possible, the reaction is said to be proceeding at ________ velocity.
A. optimal B. terminal C. infinite D. maximal