Most of the oxygen in human blood is:
A) carried in the plasma membrane of red blood cells.
B) dissolved in the plasma.
C) carried in hemoglobin.
D) carried on albumin.
Answer: C
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The stage of mitosis when chromosomes condense to form rod-shaped structures visible under the microscope is called
A) interphase. B) prophase. C) metaphase. D) anaphase. E) telophase.
Which of the following statements concerning mycorrhizae is FALSE?
a. They are symbiotic associations between a fungus and a plant root. b. They increase the uptake of nutrient minerals by the plant. c. Arbuscular mycorrhizae are extracellular. d. Endomycorrhizae are intracellular. e. Members of the Glomeromycota may be involved.
A racehorse cannot stand on one leg, but when it runs it rarely has more than one leg on the ground. Why is a running horse more stable than a standing one?
A) Its legs tilt so the hooves fall in line with its center of gravity. B) Its momentum gives it stability. C) It uses its neck for balance the way a tightrope walker uses a pole.
The capacity of photosynthesis to convert ________ energy into ________ energy provides both a nutritional and an energy basis for all heterotrophic living things.
A) Atomic; chemical B) Solar; thermal C) Solar; chemical D) Chemical; atomic E) Chemical; solar