Which of the following enzymes would you expect to find in the virion of a retrovirus, but NOT in a bacteriophage?

A) lysozyme
B) methylase
C) restriction enzymes
D) reverse transcriptase


Answer: D

Biology & Microbiology

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The chromosomal structure that anchors the spindle fiber to the chromosome is known as the ____________________

Fill in the blank(s) with correct word

Biology & Microbiology

Which one of the following statements about haplodiplontic life cycles is false? 

A. For each gene, cells of the gametophyte stage have a single allele. B. Spore mother cells produce haploid spores by meiosis. C. The gametophyte stage produces gametes by mitosis. D. The zygote is the only diploid cell in the sporophyte stage. E. Mitosis occurs in both sporophyte and gametophyte stages.

Biology & Microbiology

The two polynucleotide chains in a DNA molecule are attached to each other by

A) covalent bonds between carbon atoms. B) covalent bonds between phosphates and sugars. C) peptide bonds between amino acids. D) hydrogen bonds between bases. E) ionic bonds between "R" groups in amino acids.

Biology & Microbiology

The oxygen-carrying component in red blood cells is

A) hemoglobin. B) bicarbonate ions. C) iron atoms freely floating in the blood plasma. D) the cell membrane.

Biology & Microbiology