If at the last minute the pitcher decides to throw a curveball, which tissue responds first?
A. Nerve tissue
B. Muscle tissue
C. Ectoderm
D. Epithelial tissue
Answer: A
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During an action potential, the membrane potential ____
a. becomes more negative as sodium enters the cell b. becomes more negative as potassium leaves the cell c. becomes more positive as sodium enters the cell d. becomes more positive as sodium leaves the cell e. remains at -70 mV until threshold is reached
Transcription of ribosomal RNA is primarily the function of
A) primase. B) RNA polymerase I. C) RNA polymerase II. D) RNA polymerase III. E) mitochondrial RNA polymerase.
What is gross primary production?
A. Photosynthetic production plus energy recycled by detritivores B. The carbon fixed during photosynthesis C. The carbon fixed after accounting for cellular respiration D. Energy released by primary consumers
Which of the following statements about human population in industrialized countries is incorrect?
A) Average family size is relatively small. B) The population has undergone the demographic transition. C) Life history is r-selected. D) The survivorship curve is Type I. E) Age distribution is relatively uniform.