In mutant bacteria that cannot complete DNA replication, Okazaki fragments accumulate but are never joined together. Which enzyme is likely to be affected by the mutation?
a. initiator proteins
b. helicase
c. primase
d. DNA ligase
Ans: d. DNA ligase
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Organic compounds are distinguished by molecules that contain ________ bonded to other elements.
A. nitrogen B. hydrogen C. oxygen D. carbon
What is the difference (if any) between the structure of ATP and the structure of the precursor of the A nucleotide in RNA?
A) The sugar molecule is different. B) The nitrogen-containing base is different. C) The number of phosphates is three instead of one. D) The number of phosphates is three instead of two. E) There is no difference.
Which statement is not true?
(a) Nodes are present on horsetails. (b) The rhizome on horsetails bears roots. (c) The internode of a horsetail is the region where the leaves are attached. (d) Horsetails are members of the subphylum Sphenophyta.
Which of the following epithelial tissues secretes mucous and is dense with cilia?
A. cuboidal B. squamous C. simple D. stratified E. pseudostratified columnar