Which of these characteristics first developed in reptiles?
Select one:
a. amniotic egg
b. scales on skin
c. four-legged body
d. skull and vertebral column
e. animals with lungs
a. amniotic egg
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Most likely, immunology got its start in 1890 when these scientists discovered antibodies while developing a diphtheria antitoxin.
A) Edward Jenner and Louis Pasteur B) Elie Metchnikoff and Robert Koch C) Emil Behring and Kitasato Shibasaburo D) Jonas Salk and Albert Sabin
In five Hfr strains, each of which was used to build a time-of-entry map, the genes entered the recipient cells as follows: Strain 1: S L A C T F Strain 2: N P F T C A Strain 3: T F P N U Y Strain 4: S H Y U N P Strain 5: U N P F T C Which of
the following represents a correct compilation of these results? A) S L A C T F P N H C U B) N P F T S L A C H U T C) T C A L S P N U Y H D) U N P F T C A L S T F E) S L A C T F P N U Y H
Sympatric speciation is the most common method of speciation and accounts for almost all evolution
of new animal species. Indicate whether the statement is true or false.
When a neuron is at rest
a. the sodium and potassium gated channels are closed. b. the sodium gated channels are closed and the potassium gated channels are open. c. the sodium gated channels are open and the potassium gated channels are closed. d. the sodium and potassium gated channels are open. e. the sodium and potassium gated channels may be open or closed depending upon their location in the nervous system