Darwin developed his theory of natural selection despite having an incomplete and/or inaccurate knowledge base from which to work. Which of the following were problems for Darwin?
A) the source of variations in populations
B) an understanding of inheritance patterns from one generation to the next
C) The accepted age of the Earth was far too young to allow for the gradual changes Darwin envisioned.
D) All of the above.
D
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If you break your leg, the bone heals by forming a thickened area around the outside of the bone. Over a period of time, this thickened area:
B) is eaten away by osteoclasts. C) is digested by enzymes secreted by the muscles. D) forms new tendons, ligaments, and/or muscles. E) moves to the skin surface and is shed as dead skin.
Mendel's model organism for studying inheritance was the garden pea. What are the advantages of using peas to study genetics?
_____ Garden peas are available in many varieties. _____ Garden peas have a short generation time. _____ Garden peas produce a large number of offspring with every mating. _____ Mating between garden peas can be carefully planned and controlled.
Which of the following traits is seen only in closed circulatory systems?
a. blood moves through heart(s) b. blood remains inside a heart or vessel at all times c. blood moves through large vessels d. blood mixes with interstitial fluid
Which statement is true?
a. Red blood cells transport oxygen, and white blood cells transport carbon dioxide. b. Chloride ions bond with bicarbonate ions in order to transport oxygen from the lungs. c. Oxygen transportation in the blood is far more homogenous than carbon dioxide transportation. d. Large changes in blood pH levels are required for efficient elimination of carbon dioxide.