ADH increases fluid retention when the body sweats and decreases fluid retention when someone has consumed large amounts of water. This is an example of
A) positive feedback.
B) negative feedback.
C) neurotransmitter activity.
D) paracrine communication.
E) synaptic communication.
B
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The above Figure 26.13, shows a simplified phylogeny of closely related species of primates. This tree was proposed by comparing DNA sequence changes in the gene for cytochrome oxidase subunit II. The vertical scale represents time and the branch points represent common ancestors. What species did ancestor B give rise to?
A. Siamangs and orangutans.
B. All of the species except orangutans.
C. All of the species except siamangs.
D. All of the species except siamangs and pigmy chimps.
E. Gorillas, humans, and both types of chimps.
In order to activate the cell mediated immune response, which event must occur?
a. A naïve helper T cell must bind to an antigen-presenting dendritic cell.
b. A naïve B cell must be activated in order to activate the effector helper T cell. c. A free bacterium must pass through a lymph node where it will directly activate the effector helper T cell. d. A damaged or infected body cell must pass through a lymph node in order to activate T cells. e. Antibodies must bind to naïve helper T cells.
When the oxygen level in the blood is low, which of the following secretes erythropoietin, causing an
increase in red blood cell production? a. lungs b. kidneys c. liver d. spleen e. pancreas
Based on the suffix, a molecule of "maltose" is most likely what type of macromolecule?
A) Carbohydrate B) Lipid C) Protein D) Nucleic acid