More than 90% of deforestation occurs in tropical regions
a. True
b. False
ANSWER: True
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All Hfr strains possess an F factor integrated into the host chromosome
Indicate whether the statement is true or false.
Which of the following parasites is responsible for half of all malaria cases?
a. Plasmopara viticola b. Trypanosoma brucei c. Plasmodium falciparum d. Phytophthora infestans
Students conducted an experiment to determine the effect of light intensity on the rate of photosynthesis
They punched 40 leaf disks from spinach leaves and used a syringe partially filled with water to pull the gases from the leaf disks so that all leaf disks sunk to the bottom of the syringe. Ten (10 ) leaf disks from the syringe were placed in each of four cups and covered with 50 ml of the solutions as indicated below. All leaf disks were resting on the bottom of the cups when the experiment began. The volume of liquid in each cup and the temperature of the solutions were held constant. All cups were placed 0.5 meters from the designated light source. A large beaker of water was placed between the light and the cups to act as a heat sink to prevent a change in temperature. At the end of 10 minutes, the number of disks floating in each cup was recorded. Trial Grams of baking soda (CO22 source) Wattage of light bulb Disks floating at 10 minutes 1 0.5 25 3 2 0.5 50 5 3 0.5 75 9 4 0 75 0 Use your knowledge of the mechanism of photosynthesis and the data presented in the chart to determine which of the statements below is a correct explanation for the student's data. A) Cup 1 had a low rate of photosynthesis because 0.5 grams of baking soda did not provide a sufficient amount of CO2. B) Cup 2 had the highest rate of photosynthesis because 5 disks were floating at the end of 10 minutes using a 50 watt light bulb. C) Cup 3 had the same rate of photosynthesis as Cup 1 because they had the same ratio of disks floating to wattage of light. D) Cup 4 had the slowest rate of photosynthesis because it had the least baking soda.
Following their respective breeding seasons, several species of hummingbirds occur at the same locations in North America and several hummingbird flowers bloom simultaneously in these habitats. These flowers seem to have converged to a common morphology and color. Birds are most visually sensitive to the color red. Hummingbird flowers are pollinated by hummingbirds. Which of the following features of these flowers would indicate they have coevolved with hummingbirds? (Check all that apply)
A. flowers produce a high volume of nectar and sugar B. flowers are low to the ground C. long tubular flowers D. blooming time of the flowers coincides with the arrival of the hummingbirds E. flowers are colored violet and blue