The endoplasmic reticulum is an
What will be an ideal response?
internal membrane system found in eukaryotic cells
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Which of the following is the most likely explanation for the lack of a filter blocking the passage of alcohol between the maternal and fetal circulations in humans?
A) There has not been enough time to evolve such a barrier. B) Such a barrier would probably also block important molecules that need to be passed to the fetus. C) The maternal and fetal blood mix directly together in an area with many villi, so a barrier is impossible. D) Alcohol has some positive effects on the fetus, so evolution has resulted in an intermediate level of filtering that blocks all but the worst abuses of alcohol.
A disaccharide, such as maltose, consists of two molecules of glucose linked by what type of bond?
A. Phosphodiester. B. Glycosidic. C. Steroid. D. Peptide. E. Hydrogen.
The codon is found in the:a
mRNA. b. nontemplate strand of DNA. c. template strand of DNA. d. tRNA. e. rRNA.
During muscle contraction, the heads of myosin filaments pull actin filaments toward the center of a ________ (the contractile unit of muscle)
Fill in the blank(s) with correct word