For ions with a charge of one, which of the following is equal to one milliequivalent?
a. 0.5 millimole
b. 2 millimole
c. one millimole
d. 0.1 millimole
c. one millimole
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In some human populations, the proportion of individuals who are heterozygous for the sickle cell allele is much higher than would be expected by chance alone. Why?
A. Individuals with two normal alleles have an advantage over heterozygous individuals. B. Individuals with two harmful alleles have an advantage over heterozygous individuals. C. Individuals with two harmful alleles have an advantage over individuals with two normal alleles. D. Heterozygous individuals have an advantage over individuals with two normal alleles.
The conclusion that early hominids were bipedal is
based in part on examination of a. their S-shaped backbone. b. the position of the foramen magnum. c. footprints. d. positions of the foramen magnum, S-shaped backbone and footprints. e. length of the femur.
The myelin sheath plays an important role in neuron structure and function. However, when the myelin sheath is missing or not fully intact, there are consequences
There are many conditions that cause demyelination of neurons, some are autoimmune disorders, such as multiple schlerosis, and others are hereditary. The symptoms of these conditions vary, but often include speech impairment and difficulty coordinating movement. Which of the following correctly connects the symptoms of demyelination with the process of nerve impulse transmission? A) Demyelination prevents the formation of an action potential in sensory neurons that transmit signals from the environment to the central nervous system. B) Demyelination slows nerve impulse transmission. C) Demyelination prevents the uptake of neurotransmitters needed to propagate a message to the next neuron. D) Demyelination targets the central nervous system.
Cytoplasmic membranes of ________ are composed of unbranched phospholipids
A) bacteria B) eukaryotes C) archaea D) prokaryotes E) bacteria and eukaryotes