In the Meselson-Stahl experiment, DNA containing one heavy and one light strand was observed after
one generation of growth in media containing light nitrogen. If they had not allowed a second
generation of growth, what would these scientists have been able to conclude?
What will be an ideal response?
That DNA replication was either semiconservative or dispersive.
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Where are the fungal hyphae in a mycorrhiza?
a. the space between the cell wall and the plasma membrane of root cells. b. in the cytoplasm of root cells. c. on the surface of plant stems, above ground. d. within the vasculature of the leaves of a plant. e. on the outside of the cell wall of root cells.
What are the arrows pointing to in the accompanying figure?
a. double ionic bonds b. single ionic bonds
c. double covalent bonds d. single covalent bonds e. hydrogen bonds
The drier the air outside a leaf, the faster is water lost from the leaf through the stomata
Indicate whether the statement is true or false
Which characteristic is common to all chordates?
A) They all have vertebral columns. B) They all exhibit radial symmetry. C) They all have a notochord sometime during their life cycle. D) They all have an exoskeleton sometime during their life cycle.