When a plant becomes infected by pathogenic bacteria or fungi, it may respond by way of a fight or flight response – a
defense that cordons off an infection site surrounding it with dead cells.
a. True
b. False
ANSWER: False
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Thomas Malthus proposed that
a. species gradually improved over generations because of an inherent drive toward perfection b. humans reproduce beyond the capacity of their environment to sustain them. c. the food supply and populations multiplied at the same rate. d. artificial selection was the key to evolution. e. natural selection was the key to evolution.
The symmetry of echinoderms generally includes
A) radially symmetrical larvae and adults. B) bilaterally symmetrical larvae and adults. C) bilaterally symmetrical larvae and radially symmetrical adults. D) radially symmetrical larvae and bilaterally symmetrical adults.
One of two of a ribosome's binding sites for tRNA during translation; The P site holds the tRNA carrying the growing polypeptide chain (P stands for peptidyl tRNA)
What will be an ideal response?
Assume that a species has a diploid chromosome number of 24. The term applied to an individual with 25 chromosomes would be ________
A) euploid B) triploid C) trisomy D) aneuploidy E) aneuploidy and trisomy