Approximately how many rainforest species become extinct every minute?
a. one
b. two
c. five
d. ten
e. twenty
ANSWER: e
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Agrobacterium infects plants and causes them to form tumors. You are asked to determine how long a plant must be exposed to these bacteria to become infected. Which of the following experiments will provide the best data to address that question?
A) Determine the survival rate of Agrobacterium when exposed to different concentrations of an antibiotic. B) Measure the number of tumors formed on a plant when exposed to various concentrations of Agrobacterium. C) Measure the concentration of Agrobacterium in different soil environments where the plants grow. D) Measure the number of tumors formed on plants, which are exposed to Agrobacterium for different lengths of time.
Given the DNA sequence 5?-TAC AAA ATA CAG CGG-3?, which of these sequences represents a frameshift mutation?
A) 5?-TAG AAA ATA CAG CGG-3? B) 5?-TAC AAA TAC AGC GGG-3? C) 5?-TAC AAG ATA CAG CGG-3? D) 5?-TAC AAA ATA CAC CGG-3? E) 5?-TAC AAA ATA CAG AGG-3?
Polyploidy is the:a
presence of more than two of a certain chromosome.
b. presence of only one of each chromosome. c. presence of one extra chromosome. d. presence of multiple sets of chromosomes. e. general term for conditions such as Down or Turner syndrome
Which process does not occur in ecosystems?
A) Energy flows through the system. B) Carbon is cycled between biotic and abiotic forms. C) Producers convert light energy to chemical energy. D) Consumers directly use the energy source that powers the system.