Exchange of gases and metabolites between the blood and tissues occurs in the
A. capillaries.
B. arterioles.
C. veins.
D. arteries.
E. venules.
Answer: A
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Answer the following statements true (T) or false (F)
1. The nervous system of a cnidarian consists of a central ganglion leading into a nerve net. 2. The two body forms of some radiates is an example of alternation of generations. 3. Although a medusa and a polyp look different, they have similar body plans. 4. All Platyhelminthes are parasitic.
The proportion of the air we breathe accounted for by oxygen is approximately
A. 21%. B. 1%. C. 5%. D. 50%. E. 78%.
Four of the five answers listed below are amino acids. Select the exception
a. tryptophan b. valine c. alanine d. adenine e. leucine
Which of the following statements about crossing over is incorrect?
A) Crossing over combines sections of the maternal and paternal chromosomes. B) Crossing over plays a role in both sexual and asexual reproduction. C) There are on average one to three crossover events per chromosome. D) Crossing over increases the extent of genetic variation beyond what is possible through independent assortment alone. E) Crossing over results in recombinant chromosomes