Fossils used to define and identify geologic periods are ________ fossils.
A. index
B. body
C. trace
D. stromatolite
Answer: A
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The affinity of hemoglobin for oxygen is _______ by lowered blood pH and this ______ oxygen delivery to tissues.
A. increased, increases B. increased, decreases C. decreased, increases D. decreased, decreases E. not affected, does not affect
When a disease maintains a relatively steady, low-level frequency at a moderately regular interval, it is called ________.
A. an endemic B. hyperendemic C. sporadic D. an epidemic
The extraembryonic membrane that secretes fluid around the developing embryo is the ____
a. allantois b. amnion c. chorion d. yolk sac e. both the allantois and the yolk sac
When two adjacent bases in the same strand of DNA dimerize (form a covalent bond between them), what happens to
the DNA?
a. the original strand of DNA now contains a new DNA sequence b. the original strand of DNA is kinked, which prevents DNA polymerase from working properly
c. the original strand of DNA is methylated, which causes the bases to mismatch d. the original strand of DNA is prevented from opening during replication, so this section of DNA will not be replicated e. the original strand of DNA is unaffected, so no additional mutations arise