Which one of the following statements CORRECTLY describes how DNA is replicated?
A) Each strand of the original DNA is first completely separated from the other.
B) Replication of DNA occurs at multiple locations on the two original strands as the DNA is unzipped.
C) Replication of DNA can begin anywhere along the length of the strands.
D) The two original strands are first broken down to release nucleotides for the synthesis of new DNA.
E) One of the original strands of DNA serves as a template for new DNA; the other strand is broken down to release nucleotides for the synthesis of new DNA.
B
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Adenylyl cyclase is to cAMP as ________ is to IP3.
A. protein kinase A B. Raf1 C. phospholipase C D. calmodulin E. protein kinase C
Small pieces of DNA can be amplified by a process known as polymerase chain reaction
Indicate whether the statement is true or false
The discovery of extinct glyptodont fossils and their close resemblance to present-day armadillos led Darwin to make which of the following deductions?
a) All species remain unchanged b) Populations must grow faster than the available food supply. c) Conditions of the day were not suitable for the glyptodonts. d) The present-day armadillos were ancestors of the much larger glyptodonts. e) Extinction was part of the natural "circle of life".
Which statement comparing spermatogenesis and oogenesis is true?
A) During oogenesis, four cells are produced with each sharing equally the cytoplasm from the parent cell. B) Men, but not women, can produce gametes throughout their adult lives. C) Spermatogenesis and oogenesis rely upon mitosis to produce gametes. D) Spermatogenesis, but not oogenesis, is an example of gametogenesis.