The portion of tooth projects above the gum is called the called the
A. dentin
B. pulp
c. crown
D. enamel
E. cementum
Answer: c. crown
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Which of the following statements is NOT true of lophophorates?
A. Their tentacles serve both in respiration and in feeding. B. They have a U-shaped digestive tract. C. They have a true coelom. D. There are three phyla of them: Phoronida, Bryozoa, Brachiopoda. E. They are parthenogenetic.
You have joined a lab studying DNA replication in E. coli. The graduate student you are working with has identified a mutation in primase that makes primase very inefficient. Your project is to characterize the cells with this mutation. Predict the defects you would most likely see in the mutant E. coli cells.
A. inefficient Okazaki fragment joining B. a longer total time to replicate DNA C. a delay in the unwinding of DNA D. a delay in DNA polymerase beginning synthesis E. rapid lagging-strand synthesis but slow leading-strand synthesis
The matrix in cartilage is made of protein fibers called ________
Fill in the blank(s) with correct word
Which of the following occurs during anaphase I?
A) Cytokinesis occurs. B) Homologous chromosomes are separated. C) Sister chromatids are separated. D) Homologous chromosomes are moved to the metaphase plate. E) Crossing over begins.