Which of the following is most true of a viral DNA genome?
A. It is usually composed of unusual bases unique to viruses.
B. It uses the same four nitrogenous bases found in prokaryotic and eukaryotic DNA.
C. It may have the normal bases found in prokaryotic and eukaryotic DNA, or it may have one or more unusual bases.
D. Viruses do not use DNA for their genome.
Answer: B
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Which of the following statements describes the differences between pollination and fertilization?
A. Pollination is the transport of pollen from a microsporangium to a stigma whereas fertilization is the fusion of a sperm with an egg. B. Pollination is the production of pollen whereas fertilization is the fusion of a sperm with an egg. C. Pollination is the transport of pollen from a microsporangium to an ovule whereas fertilization is the fusion of the pollen with an ovule. D. There is no difference; the two terms are synonymous. E. All of the other choices provided are incorrect.
Which of the following is a major problem for animals that live in hyperosmotic environments?
A) preventing heat loss B) access to mineral nutrients C) preventing water loss D) obtaining enough oxygen
Which of the following is characteristic of plants?
A) a cell wall made of chitin B) chloroplasts C) hyphae D) a mycelium
The absence of necessary receptors is the basis of the defense against microbial invasion known as (natural/innate/species) resistance.
Fill in the blank(s) with the appropriate word(s).