The shark rectal gland _____
A) is involved in osmoregulation
B) is responsible for excretion of undigested residue
C) secretes a hypotonic solution
D) concentrates electrolytes necessary for homeostasis in a hypertonic environment
Answer: A
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What are endemic species?
A. Species that are threatened B. Species that are endangered C. Species that are found throughout most of the world's ecosystems D. Species that are only found in one (often small) geographic area
Which biochemical pathway fits the data presented?
Assume that a series of compounds has been discovered in Neurospora. Compounds A–F appear to be intermediates in a biochemical pathway. Conversion of one intermediate to the next is controlled by enzymes that are encoded by genes. Several mutations in these genes have been identified and Neurospora strains 1–4 each contain a single mutation. Strains 1-4 are grown on minimal media supplemented with one of the compounds A-F. The ability of each strain to grow when supplemented with different compounds is shown in the table (+ = growth; o = no growth).
media supplement
A) A ? B ? C ? D ? E ? F
B) A ? B ? C ? F ? D ? E
C) F ? B ? C ? D ? A ? E
D) A ? B ? C ? D ? F ? E
E) A ? B ? F ? E ? C ? D
Which organ arose as an outpouching from the gut in bony fish?
a. liver b. limbs c. wings d. lungs e. heart
Which of the following statements concerning rheumatoid arthritis (RA) is TRUE?
A) It occurs in humans and animals. B) The symptoms are due to damage caused by cytotoxic T cells. C) There is no genetic influence on the likelihood of developing RA. D) Accumulations of antibody complexes lead to inflammation in and destruction of the joints. E) The onset of disease is clearly correlated with having been infected with a specific microbe.