What forms the skeleton of invertebrate chordates?
a. the pharynx
b. the oral hood
c. the notochord
d. the neural crest
Ans: c. the notochord
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Which of the following is not true about the termination of replication in bacteria?
A. Termination occurs at sequences called Ter sites. B. Binding of Tus proteins to Ter sites blocks the advance of the replication fork by interacting with DnaB helicase. C. There are two clusters of Ter sites oriented in opposite directions. D. Tus-Ter complex activity is polar; the replication forks can pass through the first set but are blocked by the second. E. Replication forks can proceed past both Tus-Ter clusters, which causes problems when it runs into RNA polymerase head first.
Which of the following is a nonrenewable resource?
a. copper and gold b. fresh water c. forests d. grasslands e. fish
Mutations in myosin V cause a human disorder known as ________, involving partial albinism and neurological defects
Fill in the blank with correct word.
Which of the following nitrogenous bases is not found in DNA?
A. guanine B. thymine C. uracil D. cytosine E. adenine