The DNA polymerase reaction occurs in the ________ as incoming nucleotides are added to ________ end(s) of the growing DNA chain
A) 5' ? 3' direction; the 3'-hydroxyl
B) 5' ? 3' direction; the 3'-phosphate
C) 3' ? 5' direction; the 5'-hydroxyl
D) 3' ? 5' direction; the 5'-phosphate
E) 5' ? 3' direction or 3' ? 5' direction; both
Answer: A
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Individuals with extra or missing copies of one or more chromosomes are called ____
a. polyploids b. haploids c. aneuploids d. euploids e. diploids
The two factors that contribute to water uptake by the plant are ________ and ________
a. transpiration / photosynthesis b. positive pressure / tension c. active transport / transpiration d. respiration / translocation
A scientist produces an artificial membrane from phospholipids and notices that oxygen, but not glucose, readily moves through the membrane. What might account for the inability of glucose to move through the artificial membrane?
A. The artificial membrane lacked the appropriate types of phospholipids for glucose transport. B. The membrane lacked an adequate amount of amphipathic molecules for glucose transport. C. Thermodynamics does not allow glucose to pass through membranes produced either artificially or from living organisms. D. The artificial membrane lacked a protein needed for glucose transport. E. Oxygen readily passes through the membrane, so glucose should have as well.
Why do harmful agents cause the most severe birth defects during the embryonic period?
A) The mother's hormones are at the highest levels at this time. B) The embryo has not yet implanted into the uterus. C) This is the period when substances pass most easily through the placenta. D) This is a period of rapid differentiation when cells and tissues acquire specific functions and organs form.