Evolutionary adaptations are not always the "best" solution to a problem. Explain how the long necks of giraffes can be both advantageous and disadvantageous
What will be an ideal response?
The long neck provides an advantage to males when battling for dominance and feeding on the leaves of tall trees. However, when drinking water from a pool, the giraffe is in a very awkward position and at a disadvantage because it is vulnerable to attack by predators.
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Where are the basidia located in a typical toadstool?
A. lining the gills B. on top of the cap C. within the central stalk D. within the underground mycelium E. Any of the answer options depending on the species.
Of the following molecules, which passes through a lipid bilayer most readily?
A. carbon dioxide B. glucose C. K+ D. arginine E. RNA
In an allopolyploid organism, what is true regarding the fertility of interspecies hybrids?
A) Interspecies hybrids are fertile due to nonhomology of chromosomes. B) Chromosome doubling and nondisjunction in gametocytes can lead to homologous chromosome pairing, disjunction, and fertile hybrids. C) Interspecies hybrids will be fertile so long as there is an even number of chromosomes in the offspring. D) Mitotic nondisjunction results in haploid cells. E) Meiotic nondisjunction produces three haploid gametes and one diploid gamete.
If 15 percent of the nitrogenous bases in a sample of DNA from a particular organism is thymine, what percentage should be cytosine?
A) 30 percent B) 35 percent C) 70 percent D) 15 percent E) 40 percent