In humans, fertilization usually occurs ________ after intercourse, if an egg is present
A) 1-2 hours
B) 3-6 days
C) 6-24 hours
D) 7-10 days
E) 24-48 hours
C
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Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
What will be an ideal response?
Enzymes that catalyze the removal of a a functional group and its subsequent attachment to a new substrate are called ________.
A. oxidoreductases B. ligases C. lyases D. transferases E. isomerases
Ozone thinning over Antarctica was so profound that people referred to the lowest ozone region as the _________________.
A. ozone pollution layer B. greenhouse effect C. near-ground ozone D. radiation zone E. ozone hole
Answer the following questions true (T) or false (F)
1. The archenteron is mostly made of the mesoderm. 2. The notochord induces the formation of the neural plate in vertebrates. 3. Somites are repeating blocks of ectodermal tissue.