What is the purpose of the watery fluid secreted by the serosa of the human digestive tract?
a. emulsifies fats
b. initiates peristalsis
c. kills bacteria
d. neutralizes acidic conditions
e. reduces friction between nearby organs
ANSWER: e
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A structure made up of two or more types of tissues that performs a specific set of functions is at what level of organization?
a. Chemical b. Cellular c. Tissue d. Organ e. System
Which muscle is responsible for bending the leg at the knee and turning the foot downward?
a. Gastrocnemius b. Deltoid c. Biceps femoris d. Achilles tendon e. Latissimus dorsi
In the light-dependent reactions of photosynthesis,NADP+ gets its electrons to become NADPH from ____
a. ATP synthase b. the flow of hydrogen ions c. electron transfer chains d. oxygen gas e. glucose
Refer to Figure 29-2. The structure labeled 11 is:
a. a zygote.
b. a gamete.
c. a sporangium.
d. a zoosporangium.
e. a zoospore