The additive effect of one neuron sending many EPSPs to another neuron over a brief period of time is
called spatial summation.
Indicate whether the statement is true or false.
ANS: F, temporal summation
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The process by which homologous chromosomes exchange genetic material
A. is crossing-over. B. occurs only during DNA replication. C. is independent assortment. D. is random fertilization. E. occurs only in animals.
Which of the following is one of Chargaff’s
rules about DNA structure?
a. phosphate groups are connected to sugars by covalent bonds b. base pairs connect to each other by hydrogen bonds c. the amounts of adenine and thymine are the same as are the amounts of cytosine and guanine d. the DNA molecule forms into a double helix e. the strands in a DNA molecule run in opposite directions
In a defined medium, _____.
a. the exact chemical composition of the medium is known b. agar is available for microbial nutrition c. blood may be included d. organic chemicals are excluded
All of the following statements are true about seed germination EXCEPT
A. some seeds require fire or bacterial action before germination can occur. B. all seeds require a period of dormancy before germinating. C. in the temperate region, seeds often require a period of cold weather before dormancy is broken. D. fleshy fruits contain inhibitors of germination.