Which statement is NOT true?
a. Membranes are often perforated by proteins
that extend through both sides of the
membrane.
b. Some membranes have proteins with
channels that allow for the passage of
hydrophilic substances.
c. Hydrophilic substances have an easier time
passing through the lipid bilayer than do
hydrophobic substances.
d. The current concept of a membrane is best
summarized by the fluid mosaic model.
e. All of these statements are NOT true
C
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Which scenario is an example of positive feedback?
a. When oxygen levels are low, the kidneys secrete erythropoietin, which stimulates the proliferation and differentiation of red blood cells until oxygen demands are met. b. As blood pressure increases, specialized neurons relay the change to the brainstem, which in turn, decreases the contractility of the heart and leads to vasodilation, thereby decreasing blood pressure. c. After an injury, chemicals released at the site of injury will activate platelets, which will in turn activate additional platelets, and so on, until the clot has formed and the injury is no longer bleeding. d. When stress levels are high, the hypothalamus secretes corticotropin-releasing hormone (CRH), which in turn stimulates the secretion of adrenocorticotropic hormone (ACTH), which then triggers the release of cortisol. Increased cortisol levels then inhibit the release of CRH and ACTH. e. After eating, when glucose levels are high, insulin levels increase, leading to an increase in glycogen and fat synthesis to remove excess glucose from circulation.
Which of the following countries is not a member of the Economic Monetary Union?
a. England b. Italy c. Spain d. Finland
A diploid organism
a. contains several copies of the same chromosomes. b. contains only autosomes. c. contains one copy of each chromosome. d. contains chromosomes that all have the same size. e. contains two of each type of chromosome
Refer to Figure 31-1. Which of the following structures was produced by meiosis?
A. 1 B. 3 C. 4 D. 5 E. 6