Most photosynthesis in typical C3 angiosperms takes place in the
a. palisade mesophyll
b. spongy mesophyll
c. epidermis
d. pericycle
e. vascular bundles
Ans: a. palisade mesophyll
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Which of the following is the best evidence for the lock and key hypothesis of enzyme action?
A. All isolated enzymes have been identified as proteins. B. Enzymes determine the direction of a reaction. C. Enzymes are found in living organisms and speed up certain reactions. D. Compound similar in structure to the substrate inhibits the reaction
Extracts of pathogenic bacteria can transform harmless bacteria to harmful bacteria unless ____ enzymes are added to
the extract.
a. protein transfer b. mRNA-degrading c. tRNA-degrading d. DNA-degrading e. nucleic transfer
The human genome contains approximately 40,000 genes
a. True b. False
During childbirth, the hormone oxytocin stimulates the smooth muscles of the uterus to contract; however, smooth muscles lining the digestive tract are not affected by oxytocin. Which statement correctly explains this scenario?
A) Oxytocin is released by the fetus and diffuses into the amniotic fluid inside the uterus. Therefore, only uterine muscles are stimulated. B) The digestive tract muscles of the mother's body are temporarily paralyzed by the anti-pain medications administered during labor. C) Oxytocin is a local hormone released by the uterus, so other muscles do not receive its signals. D) Smooth muscles of the digestive tract do not contain receptors for oxytocin. E) Endocrine hormones such as oxytocin do not travel through the blood, so they do not make contact with digestive tract muscles.