Which of the following should NOT cross the blood-brain barrier with ease?
A) large, polar molecules B) glucose
C) lipid-based molecules D) carbon dioxide
Answer: A
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Glands that release their product to a surface via a duct are referred to as __________ glands.
A. exocrine B. holocrine C. apocrine D. endocrine E. merocrine
________ transport is required to move a substance across a membrane against a concentration gradient.
Fill in the blank(s) with the appropriate word(s).
Only autosomal trisomies involving chromosomes 13, 18, and 21 are survivable. Why would this be?
A. These are redundant chromosomes. B. These are relatively short chromosomes. C. These chromosomes have no genes. D. These are relatively gene-poor chromosomes. E. These are relatively long chromosomes.
Intramembranous bones develop by replacement of a hyaline cartilage model with bone tissue.
Answer the following statement true (T) or false (F)