The anatomical structure shown in the accompanying figure is of ____
a. venous valves
b. pulmonary veins
c. the inferior valve
d. the right myocardial sac
e. the heart apex
ANSWER: a
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Bacteria can act as probiotic agents, such as species of ________ added to yogurt, to help impart health effects to the intestinal tract.
What will be an ideal response?
Geological evidence reveals that the atmosphere on Earth originally lacked oxygen. What process initiated the build-up of oxygen in the atmosphere?
a. Fixing carbon dioxide from the atmosphere resulted in oxygen being emitted. b. The formation of ATP and harvesting of the energy in chemical bonds resulted in oxygen being released. c. Water, used as a hydrogen source, resulted in oxygen as a waste product. d. The first terrestrial plants utilized carbon dioxide and gave off oxygen, just like plants today.
When two organisms do not mate due to the fact that they mate at different times of the year, it is
known as ____.
a. behavioral isolation b. ecological isolation c. gametic isolation d. mechanical isolation e. temporal isolation
Why don’t animal cells have chloroplasts?