Swim bladders ________
A) contain the gills
B) are required for fish to exchange gases with the surrounding water
C) are present in both bony and cartilaginous fishes
D) help bony fish maintain buoyancy
D
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Match the following items with the correct phrases.
_______1. Found in the cell walls of both Gram-positive and Gram-negative bacteria, but greater quantities are found in the cell walls of Gram-positive bacteria. _______2. Found in the cell walls of algae, but not in the cell walls of other microorganisms. _______3. Found in the cell walls of Gram-positive bacteria, but not in the cell walls of Gram-negative bacteria. _______4. Found in the cell walls of fungi, but not in the cell walls of other microorganisms. _______5. Found in the cell walls of both Gram-positive and Gram-negative bacteria, but not found in the cell walls of archaeans. a. cellulose b. chitin c. peptidoglycan d. teichoic acids
Which statement about the Malpighian tubules is FALSE?
a. Water and some solutes are transported into the Malpighian tubules via active transport. b. The Malpighian tubules empty into the gut of the insect. c. Water, some salts, and other solutes are reabsorbed into the hemolymph in the rectum. d. The excretory system of an insect may contain up to several hundred Malpighian tubules. e. The blind ends of the Malpighian tubules are bathed in hemolymph
An inherited disease results from abnormal mitochondria passed from mother to child. Using your knowledge of mitochondria's function within human cells, which of the following is the most likely description of the symptoms of this disease?
a) color blindness b) inability to absorb iron, resulting in extreme anemia c) extreme sensitivity to mutagens such as x-rays and sunlight, increasing the chance of cancer d) fragile bones and arthritis e) extreme muscle weakness
Scientists will never know for sure why dinosaurs became extinct. Therefore, scientists should
A) accept the current theory about dinosaur extinction as the best possible theory. B) continue to learn as much as they can about dinosaur extinction. C) stop studying dinosaurs and study only living animals. D) work to raise live dinosaurs to study.