Organisms with a circulating body fluid that is distinct from the fluid that directly surrounds the body's cells are likely to have _____
A) an open circulatory system
B) a closed circulatory system
C) a gastrovascular cavity
D) branched tracheae
E) hemolymph
Answer: B
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A chlorophyll molecule has a porphyrin ring containing a single atom of:
a. manganese. b. magnesium. c. phosphorus. d. nitrogen. e. iron.
Which of the following names is incorrectly matched with their discovery?
a. Beijerinck and Winogradsky—Gene therapy b. Lancefield—Classification of streptococci c. Watson and Crick—Structure and replication of DNA d. Avery, MacLeod, McCarthy—DNA was the hereditary material e. Lederberg and Tatum—Transfer of genetic material via conjugation
In mammals, oxytocin is released during _____.
A. sexual intercourse only B. lactation only C. labor only D. sexual intercourse, lactation, and labor E. sexual intercourse and labor
Two hydrogen atoms (atomic number 1 ) form a covalent bond. Which of the following is true?
A) Both hydrogen atoms now have two protons in their outer shell. B) One hydrogen atom now has zero electrons in its outer shell, and the other has two. C) Both hydrogen atoms now have two electrons in their outer shell. D) Each hydrogen atom still has one electron in its outer shell. E) One hydrogen atom now has zero protons in its outer shell, and the other has two.