Stromatolites were formed by
a. heterotrophic bacteria.
b. plants.
c. animals.
d. photosynthetic bacteria.
e. red algae.
d
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You are working with a specific enzyme-catalyzed reaction in the lab. You are a very careful experimentalist, and as a result, at the beginning of each of your experiments, you measure the temperature in the lab. On days 1 through 5, the temperature in the lab was 20oC. Today is day 6 of your experiment, and the temperature in the lab is 30oC. How do you predict that this will alter the rate of
your enzyme-catalyzed reaction? A. It will decrease the rate B. It will increase the rate C. It could possibly increase or decrease the rate D. it will not affect the rate
Which of the following couplets DOES NOT give the correct kinds of insects contained in the Order?
A. Coleoptera: beetles B. Lepidoptera: grasshoppers C. Diptera: flies D. Hemiptera: bugs E. Hymenoptera: ants, bees, and wasps
Why are most cells small?
a. Because they don't produce enough energy to grow larger. b. Because the body has limited space. c. Because the surface-to-volume ratio must be adhered to for proper cell function. d. Because there aren't enough electrolytes to support large cells. e. Because large cells would not be able to undergo mitosis.
The larger the intitial population size, the less likely it will become extinct during an environmental change.
a. true b. false