The plasma membrane is referred to as a mosaic because of the presence of ________.
stationary proteins in a uniform arrangement
carbohydrates in changing patterns
phospholipids that are in constant motion
moving proteins in a random arrangement
moving proteins in a random arrangement
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Each of the following is an example of homeostasis except one. Identify the exception.
A) A rise in blood calcium levels triggers the release of a hormone that lowers blood calcium levels. B) Increased pressure in the aorta triggers mechanisms to lower blood pressure. C) A decrease in body temperature triggers a neural response that initiates physiological changes to increase body temperature. D) A rise in estrogen during the menstrual cycle increases the number of progesterone receptors in the uterus. E) Increased blood sugar stimulates the release of a hormone from the pancreas that stimulates the liver to store blood sugar.
The C cells of the thyroid gland produce
A) only calcitonin. B) only TSH. C) only parathyroid hormone. D) only thyroxine. E) thryoxine and TSH.
The space between two neurons is called the ________.
A. synapse B. terminal button C. vesicle D. soma
In the case of blood types, both alleles A and B may be expressed as the phenotype. This exemplifies:
A) polygenic inheritance. B) incomplete dominance. C) codominance. D) sex-linked inheritance.