Explain why a dry, hot, breezy day can result in the leaves of certain plants having to completely
replace their water each hour?
What will be an ideal response?
The lower the relative humidity, the lower (more negative) the water potential in the atmosphere. A
hot day will speed evaporation at the leaf surface. Air moving across a leaf surface carries water vapor
away.
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In Drosophila melanogaster there is a sex-linked gene for eye color that is found only on the X
chromosome. The allele for red eye color (Xw+) is dominant over the allele for white eye color (Xw). You examine a vial of 100 flies that are all offspring from a single genetic cross. You find only redeyed females and red-eyed males present. Flies from the vial were allowed to interbreed, and in the next generation you find only red-eyed females, but you find both red-eyed and white-eyed males. The genotypes of the original parents were
a. Xw+Xw+; XwY. b. Xw+Xw; XwY. c. XwXw; Xw+Y. d. Xw+Xw; Xw+Y. e. XwXw; XwY.
What is the difference between a nucleoside and a nucleotide?
a. A nucleoside is only found in RNA, but nucleotides are found in both. b. A nucleoside forms through hydrogen bonding, but nucleotides form through covalent bonding. c. A nucleoside is a nucleotide without the phosphate group(s). d. A nucleoside results from mutation and nucleotides are non-mutated forms.
A small group of mice are released on an island without mice but with abundant food for mice and no predators. Initially, the growth of the mouse population will be limited mainly by what?
A. the carrying capacity B. the biotic potential C. only density-dependent factors D. only density-independent factors
DNA viruses replicate in the:
Mitochondrion Endoplasmic reticulum Cytoplasm Nucleus Ribosomes