Cephalization means having a ________.
a. tail
b. digestive tract
c. kidney
d. brain
Ans: d. brain
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True or False: Only 10% of the nitrogen added to croplands ends up in food
A. true B. false
A 38-year old woman is going to ovulate in about a week. For how long has the primary oocyte in her Graafian follicle been arrested at prophase I of meiosis?
A. About a day B. 1 week C. 3 weeks D. 38 years
Which statement best describes the difference between passive immunity and active immunity?
A) Active immunity refers to T lymphocytes actively destroying pathogens through phagocytosis and passive immunity describes the indirect attack by B lymphocytes through secretion of antibodies. B) Active immunity fight viruses such as rabies by injecting antibodies collected from that animal whereas passive immunity is injecting antibodies from a safe form of the pathogen. C) Active immunity depends on injecting antibodies into the body whereas passive immunity includes vaccination or immunization of a safe form of a pathogen. D) Active immunity depends on the ability of a person's immune system to mount a response to a pathogen and induces immunological memory, whereas in passive immunity only antibodies are introduced to the body allowing only for short-term protection. E) Active immunity is only active for a short time frame in the body whereas passive immunity has long-lasting immunity in the body
The proteins associated with the light-dependent reactions of photosynthesis are located ____.
A. on the outer membranes of the chloroplast B. in the stroma C. on the thylakoid membrane D. throughout the cytoplasm of plant cells E. in the thylakoid compartment