The DNA of two different viruses, A and B, are isolated and the melting point determined as shown here. Which one of the following is a conclusion consistent with the data?
A. Virus A is an animal virus and virus B is a bacterial virus (bacteriophage).
B. Virus B is triplex DNA and virus A is duplex DNA.
C. Virus B is an RNA-DNA duplex.
D. Virus B has a higher percentage of guanine nucleotides compared to virus A.
E. Virus A has a greater amount of methylated cytosines than virus B.
D
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Indicate whether the statement is true or false.
How many membranes make up a chloroplast?
A. 1 B. 2 C. 3 D. 5
Which of the following couplets DOES NOT give the correct kinds of insects contained in the Order?
A. Coleoptera: beetles B. Lepidoptera: grasshoppers C. Diptera: flies D. Hemiptera: bugs E. Hymenoptera: ants, bees, and wasps
Amongst the chordates, which features are unique to the tunicates?
A. sexual reproduction and complete digestive system B. leathery outer covering and sessile adult stage C. sessile adult stage and aquatic lifestyle D. gill slits and bilateral symmetry E. leathery outer covering and an excurrent siphon