Campbell Biology 9th Edition solutions

Campbell Biology 9
Give examples of human actions that could expand a species distribution by changing its (a) dispersal or (b) biotic interactions

Campbell Biology 9
How are root hairs and microvilli analogous structures? (See Figure 6.8 on p. 100 and the discussion of analogy on p. 540 of Concept 26.2.)

Campbell Biology 9
While waiting at an airport, Neil Campbell once overheard this claim: Its paranoid and ignorant to worry about industry or agriculture contaminating the environment with their chemical wastes. After all, this stuff is just made of the same atoms that were already present in our environment. Drawing o

Campbell Biology 9
Grasslands typically do not flourish when large herbivores are removed. In fact, they are soon replaced by broad-leaved herbaceous eudicots, shrubs, and trees. Based on your knowledge of the structure and growth habits of monocots versus eudicots, suggest a reason why

Campbell Biology 9
Copy the polynucleotide strand in Figure 5.26a and label the bases G, T, C, and T, starting from the 5end. Assuming this is a DNA polynucleotide, now draw the complementary strand, using the same symbols for phosphates (circles), sugars (pentagons), and bases. Label the bases. Draw arrows showing th

Campbell Biology 9
Darwin suggested looking at a species close relatives to learn what its ancestors may have been like. How does his suggestion anticipate recent methods, such as phylogenetic bracketing and the use of outgroups in cladistic analysis?

Campbell Biology 9
Some athletes prepare for competition at sea level by sleeping in a tent in which PO2 is kept artificially low. When climbing very high peaks, some mountaineers breathe from bottles of pure O2. In a short essay (100150 words), relate these behaviors to the mechanism of O2 transport in the human body

Campbell Biology 9
The feather moss Pleurozium schreberi harbors species of symbiotic nitrogen-fixing bacteria. Scientists studying this moss in northern forests found that the percentage of the ground surface covered by the moss increased from about 5% in forests that had burned 35 to 41 years ago to about 70% in fore

Campbell Biology 9
Evolutionary biologists have coined the term exaptation to describe a common occurrence in the evolution of life: A limb or organ evolves in a particular context but over time takes on a new function (see Chapter 25). What are some examples of exaptations in plant organs?

Campbell Biology 9
Imagine an elongated cell (such as a nerve cell) that measures 125 1 1 arbitrary units. Predict how its surface-to-volume ratio would compare with those in Figure 6.7. Then calculate the ratio and check your prediction.

Campbell Biology 9
Apple growers in Japan sometimes make a nonlethal spiral slash around the bark of trees that are destined for removal after the growing season. This practice makes the apples sweeter. Why?

Campbell Biology 9
If the nucleotide variability of a locus equals 0%, what is the gene variability and number of alleles at that locus? a. gene variability 0%; number of alleles 0 b. gene variability 0%; number of alleles 1 c. gene variability 0%; number of alleles 2 d. gene variability 0%; number of alleles 2 e. Wit

Campbell Biology 9
Suppose you eat a serving of fish. What reactions must occur for the amino acid monomers in the protein of the fish to be converted to new proteins in your body?

Campbell Biology 9
Draw the following apoptotic pathway, which operates in human immune cells. A death signal is received when a molecule called Fas binds its cell-surface receptor. The binding of many Fas molecules to receptors causes receptor clustering. The intracellular regions of the receptors, when together, bind

Campbell Biology 9
Construct a table that organizes the following terms, and label the columns and rows. phosphodiester linkages polypeptides monosaccharides peptide bonds triacylglycerols nucleotides glycosidic linkages polynucleotides amino acids ester linkages polysaccharides fatty acids

Campbell Biology 9
Two pea plants heterozygous for the characters of pod color and pod shape are crossed. Draw a Punnett square to determine the phenotypic ratios of the offspring.

Campbell Biology 9
Draw a model of the control circuit(s) required for driving an automobile at a fairly constant speed over a hilly road. Indicate each feature that represents a sensor, stimulus, or response.

Campbell Biology 9
Using a series of arrows, draw the branched metabolic reaction pathway described by the following statements, and then answer the question at the end. Use red arrows and minus signs to indicate inhibition. L can form either M or N. M can form O. O can form either P or R. P can form Q. R can form S. O

Campbell Biology 9
You design Drosophila crosses to provide recombination data for gene a, which is located on the chromosome shown in Figure 15.12. Gene a has recombination frequencies of 14% with the vestigial-wing locus and 26% with the brown-eye locus. Approximately where is a located along the chromosome?

Campbell Biology 9
One of the many mutant opponents that the movie monster Godzilla contends with is Mothra, a giant mothlike creature with a wingspan of several dozen meters. Science fiction creatures like these can be critiqued on the grounds of biomechanical and physiological principles. What problems of respiration