The accompanying figure represents a sequence of events occurring in the neuronal membrane (designated by the numbers 1 and 2). The letter “I” indicates an ion. What event is mostly likely being portrayed in this figure?
a. activation of voltage-gated sodium channels
b. activation of voltage-gated potassium channels
c. activation of voltage-gated chloride channels
d. activation of sodium-chloride pumps
e. activation of sodium-potassium pumps
a
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Body parts derived from endoderm include
A) epidermis and dermis of the skin as well as hair and nails. B) the urinary bladder epithelium, pancreas, and digestive tract lining. C) all connective tissues, including blood, bone, and cartilage. D) the linings of the blood vessels, trachea, and body cavities.
A person who has two identical alleles for a particular gene is ________ for that gene.
A) dominant B) heterozygous C) homozygous D) positive
Acetylation is irreversible
Indicate whether the statement is true or false.
Nucleosomes are bead-like structures ____
a. that form during interphase to assist with DNA uncoiling b. that are a major class of proteins in chromatin c. composed of histone wrapped with DNA d. composed of linked homologous chromosomes e. composed of pyrimidines and purines