Consider the structure of a typical nerve cell. The nucleus is found in the ______ and the axon branches to form a number of ________
a. dendrites; cell bodies
b. dendrites; synapses
c. cell body; dendrites
d. cell body; synapses
e. axon; synapses
D; The cell body contains the nucleus. The dendrites bring information in the form of electrical messages to the cell body and the axon carries information away. The axon communicates to other cells by branching into button-like structures that form synapses with the cell(s) receiving the information.
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Ras proteins are of interest to researchers because ____
a. of their role in reproduction d. of their role in relieving cluster headaches b. of their role in liking plant hormones to germination e. of their role in bringing about the fight – or-flight response c. of their role in the development of many types of cancer
A centromere is least likely to ____
a. divide in anaphase of mitosis b. connect sister chromatids c. attach chromosomes to spindle fibers d. cross over during prophase I of meiosis e. be a component of DNA
Reptiles, birds, and some mammals share which of the following characteristics?
A) produce amniotic eggs B) are predators C) are warm-blooded D) exhibit live birth E) have light, hollow bones
Gases such as oxygen and carbon dioxide can pass through a plasma membrane by simple diffusion, because they are uncharged, nonpolar molecules.
a. true b. false