A group of specialized cells of similar structure and function is a(n)
a. organ system.
b. cell cluster.
c. organ.
d. tissue.
e. organism.
D
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If a fungus encountered a particularly rich food source, what would be the expected result?
A. Hyphae would branch and extend rapidly to form a mycelium. B. Hyphae would stop growing in length, but increase in diameter. C. Individual hyphae would begin to produce spores. D. Hyphae would stop growing and a fruiting body would form to exploit the food source. E. The mycelium would break down into widely separated hyphae.
HIS4 trp1; HIS4 trp1; his4 TRP1; his4 TRP1
A haploid yeast strain has mating type a and genotype his4 TRP1. A different haploid yeast strain has mating type ? and genotype HIS4 trp1. The two strains mate and produce diploid offspring with genotype his4 TRP1 / HIS4 trp1. The diploid cells undergo meiosis to produce a variety of tetrad types. In the following questions, the genotypes of the spores in a tetrad are shown. For each tetrad, tell what type it is: parental (PD), non-parental (NPD), or tetratype (T). A) PD B) NPD C) T D) cannot be determined
In a flowering plant, which structure includes the ovary?
a. the stamen b. the ovule c. the calyx d. the carpel
Ionizing events from irradiation are considered to be direct effects if they occur with _____ molecules.
a) water b) DNA c) protein d) both water and DNA