With regard to blood circulation, what is the difference between an artery and a vein?
What will be an ideal response?
Arteries take blood away from the heart while veins take blood to the heart.
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What organic compound makes up 25% of the secondary walls of cells of older stems and roots?
a. Cellulose b. Glycogen c. Glucose d. Lignin e. Starch
Which statement about stress is incorrect?
A) Stress increases as population density increases. B) Stress may trigger the release of specific chemical signals or pheromones. C) Stress can stimulate growth and increase the rate of reproduction. D) Stress may result in increased vulnerability to disease.
One function of plants cells is to use light energy to make nutrients. Which structure enables plant cells to carry out this function?
A) cell wall B) nucleus C) chloroplasts D) cell membrane
Sir Alexander Flemming
A) coined the term chemotherapy B) discovered salvarsan in 1910 C) discovered the antibiotic penicillin D) accomplished two of the above.