Signals from motor neurons result in action potentials in muscle fibers, which in turn causes the
__________ to release stored calcium ions. Fill in the blank(s) with the appropriate word(s).
sarcoplasmic reticulum
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The outer membrane of the mitochondrion is not a significant permeability barrier because it contains transmembrane proteins called ________.
Fill in the blank(s) with the appropriate word(s).
Which tooth type may not be present in herbivores yet prominent in carnivores?
a. canines b. incisors c. molars d. premolars e. The teeth types of herbivores and carnivores are the same.
In angiosperms, meiosis of cells in the ovule give rise to haploid megaspores. What happens next?
a. Mitosis gives rise to a seed. b. Mitosis gives rise to an egg, a cell with two nuclei. c. Mitosis gives rise to a sporophyte. d. Meiosis gives rise to a dipold egg and a cell with two nuclei. e. Meiosis gives rise to a more megaspores.
Which of the following is NOT a chelicerate?
a. tick b. mosquito c. spider d. horseshoe crab e. scorpion