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You are an ecologist interested in energetics of ecological systems. You begin your current research program with a study of primary productivity of corn plants growing in a field in Iowa during mid-summer. At noon on a sunny day, you enclose a single leaf (still attached to the plant) in a transparent chamber. The chamber is connected to a measurement device called an infrared gas analyzer, which is capable of measuring minute changes in the concentration of carbon dioxide (CO2) of the atmosphere within the chamber. The chamber is also maintained at a constant 30°C (same as the outside air temperature) during your observations. You first expose the corn leaf to full sunlight and observe that CO2 is being depleted by the leaf from the chamber at a rate of 16 mg CO2 per 100 cm2 leaf area per hour. The measurements are taken over time so both photosynthesis and respiration are occurring during the measurement. You then cover the chamber with aluminum foil to exclude all light and observe that CO2 is being released by the leaf into the chamber at a rate of 2 mg CO2 per 100 cm2 leaf area per hour. 1. What is the rate of net primary productivity for this leaf? Explain your answer. 2. What is the rate of gross primary productivity for this leaf? Explain your answer.
Analyze the trend in atomic radius for elements located within the same group on the periodic table. Explain this trend.
How is it that, unlike polysaccharides such as starch and glycogen, the oligosaccharides on the surface of the plasma membrane can be involved in specific interaction? How is this feature illustrated by determining a person's blood type prior to r..
During exercise does the sympathetic nerve activity increase or decrease. What does the parasympathetic nerve activity do?
If you were to carry out temperature experiments at a higher or lower [S], what effect would [S] have on the temperature optimum for amylase? Explain.
why Absorption of an inhaled gas is usually.
Create the action potential of a skeletal muscle cell and the action potential of a ventricular myocyte. Be sure to label the phases and the ions that are mediating the change in electrical potential.
Give a mechanistic explanation for finding which is consistent with all the data. Explain your reasoning
A DNA polymerase made an error during the replication of an important gene region of DNA. None of the DNA repair enzymes detected or repaired the damage.
Describe how the hypothalamus regulates the secretion of anterior pituitary hormones and identify all of the individual hypothalamic regulatory factors. Describe how the hypothalamus controls the activity of the posterior pituitary gland.
Two linked genes, S and T, are separated by 8 cM. Peter, who has the genotype ST/st, marries Oliviam who is st/st. peter's father was ST/ST. what is the probability that peter and olivia's first child will be St/st? What is the possibility that their..
You run a test of a tall pea plant. your results are 135 tall and 2 short. What is the genotype to the tall parent? Prove with a punnett squate.
Why do plant cells have mitochondria, but animal cells don't have chloroplasts? Give a phylogenic explanation.
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