Gastrulation in human embryos occurs about
___ after fertilization.
a. 5 days
b. 2 weeks
c. 4 weeks
d. 2 months
e. 5 months
B
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Which of the following is true about all E.coli?
a. E.coli produce toxic proteins b. E.coli is only found in cows, deer, goats, and sheep c. E.coli is a common bacterium living in our intestines d. E.coli originate from fresh produce e. E.coli strains harmful to humans are also harmful to cattle
The anatomical structure shown above is of
a. venous valves. b. pulmonary veins. c. the inferior valve. d. the right myocardial sac. e. the heart apex.
Foods that are potentially poisonous or inedible can often be detected by the ________ taste receptors, which are located at the very back of the tongue
Fill in the blank(s) with correct word
Which energy-producing process is thought to have come first during cellular evolution?
a. Photosynthesis b. Glycolysis c. Oxidative phosphorylation d. All originated at the same time