Which pressure changes with the phases of respiration from a negative value during inspiration and a positive value during expiration?
A) transpulmonary pressure
B) rebound pressure (elastic recoil)
C) intrapleural pressure
D) intra-alveolar pressure
E) atmospheric pressure
Ans: D) intra-alveolar pressure
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As the result of exposure to a mutagen, cytosine is substituted for thymine in one strand of DNA. Upon subsequent DNA replication, one of the daughter cells will have a GC pair in this position instead of an AT pair. This is called a(n) ________ mutation.
A. insertion B. transition C. frameshift D. transversion
Bacteria have a region of the cytoplasm known as the ________, which is not bounded by a membrane but contains the chromosome.
Fill in the blank(s) with the appropriate word(s).
The allelic make up of a cell or individual is referred to as its
A. blueprint. B. genotype. C. phenotype. D. pedigree.
What is the main difference between protists and bacteria?
a. Protists are unicellular, bacteria are multicellular. b. Bacteria have DNA, protists do not. c. Protists cannot cause infections, bacteria can d. Protists have a nucleus, bacteria do not e. Bacteria are always gram-negative, protists are gram-positive