Which of the following distinguish gnathostomes from other chordate lineages?
a. operculums
b. jaws
c. claspers
d. bony scales
Answer: b. jaws
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Rosalind Franklin is credited with ____
a. discovering DNA’s double helical structure b. discovering DNA c. first isolating DNA d. building the first DNA model e. cloning DNA
Muscle cells are not typical cells because
a. groups of them fuse in the embryo to form multinucleated fibers. b. they contain actin proteins. c. they contain myosin proteins. d. they respond to stimuli. e. all of these are true.
Which one of the following hormones would be tested for in a home pregnancy test?
A) estrogen B) hCG C) progesterone D) LH E) FSH
Virulent and temperate phages differ in that ________.
A. virulent phages always result in the lysis of the host cell, whereas temperate phages may lyse the host cell, or they can enter a lysogenic cycle whereby they integrate their genome into the genome of the host cell B. temperate phages integrate their genome into that of the host cell, causing uncontrolled growth and ultimately lysis of the cell, whereas virulent phages remain in the lysogenic phase indefinitely C. temperate phages always result in the lysis of the host cell, whereas virulent phages may lyse the host cell, or they can enter a lysogenic cycle whereby they integrate their genome into the genome of the host cell D. virulent phages cause mutations in the host cell genome, whereas temperate phages have no genetic effect on the host cell