What type of cells are joined end-to-end, conduct water and are connected to each other with strips of wall material?
A. tracheids
B. vessel members
C. sieve cells
D. sieve tube members
E. companion cells
Answer: B
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Genetic exchange between 2 homologous chromosomes is called
A. synapsis. B. pleiotropy. C. crossing over. D. allelic exchange. E. independent assortment.
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In the circulatory system, the largest pressure drop occurs across which blood vessels?
A) arteries B) veins C) capillaries D) arterioles E) venules
Essential fatty acids, which are required in the human diet, are
A) those fatty acids that humans are unable to synthesize. B) the fatty acids that humans can synthesize from simpler molecules. C) the fatty acids used in the construction of the phospholipids of cell membranes. D) stored in the gallbladder.