Humans belong to which subgroup of mammals?
A) Marsupials
B) Monotremes
C) Eutherians
D) Cetaceans
C
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The most important stimulus in the control of respiration is the concentration in the blood and other body fluids of
(a) oxygen (O2). (b) carbon dioxide (CO2). (c) hydrogen ions (H+). (d) nitrogen (N2).
In a fruit fly embryo, a homeotic gene Antp determines where legs grow. When the promoter of Antp is mutated, a fly ends up with legs growing out of its head in place of antennae. In this mutation
A. antennae grow where the legs would normally be found. B. Antp must be turned off in all of the fly cells. C. Antp must be turned on in the head. D. the Antp gene, and its transcription factor, and enhancer sequence are turned on in the head. E. the Antp enhancer sequence, or transcription factor, is not functional.
A denatured protein has lost its _____________________
Fill in the blank(s) with the appropriate word(s).
Protozoa are monophyletic.
Answer the following statement true (T) or false (F)