Which of the following is a nucleotide?
A) adenine + deoxyribose
B) sugar + nitrogenous base
C) adenine + ribose + phosphate
D) phosphate + ribose
Ans: C) adenine + ribose + phosphate
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In recombinant DNA techniques, the gaps in the paired DNA fragments are closed by ____
a. restriction enzymes b. DNA ligase c. DNA polymerase d. DNA replicase e. reverse transcriptase
Gram-positive encapsulated diplococci found in sputum is indicative of
A. E. coli. B. Pseudomonas. C. Streptococcus pneumoniae. D. Neisseria gonorrhea.
Parasitism is a density-independent factor of population control
Indicate whether the statement is true or false.
Which of the following shows the correct chronological order (geologically oldest to most recent) of near or total extinctions for the organisms listed?
A) dinosaurs, psilopsids, marine invertebrates, large mammals B) psilopsids, marine invertebrates, dinosaurs, large mammals C) large mammals, marine invertebrates, dinosaurs, psilopsids D) marine invertebrates, dinosaurs, psilopsids, large mammals