Long-day plants flower only when hours of darkness are ________
a. equal to hours of light
b. decreasing
c. less than a critical value for the species
d. greater than a critical value for the species
c
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If a set of genes is induced in the presence of the controlling substance, it is referred to as ________ control.
Fill in the blank(s) with the appropriate word(s).
Figure 13.3 provides examples of various types of sequences that can be found in a segment of double-stranded DNA. Which one of the following is most likely to be protein-coding?
A. noncoding RNA B. single-copy gene C. dispersed repeat D. tandem repeat E. simple-sequence repeat
In the condition called athlete's foot, the fungus Trichophyton consumes the keratin protein found in hair, nails, and dead skin. Which of the following descriptors does not apply to Trichophyton?
A. Saprobe B. Parasite C. Eukaryote D. Heterotroph
In which season does lake stratification occur?
A) summer B) spring C) fall D) winter