Heartworms (Dirofilaria immitis) are a type of roundworm that live in and obtain nutrients from the tissues of dogs. These invertebrates affect the function of the dog's circulatory system in a way that can lead to the dog's death. Which term best describes the relationship between heartworms and dogs?
a) mutualism
b) predation
c) parasitism
d) competition
Ans: c) parasitism
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A layer of host cell membrane attached to a virus is called:
a. An envelope b. A protein coat c. A capsomere d. A capsid e. A plasmid
Explain the respective advantages associated with operons being inducible (e.g., the lactose operon) or repressible
(e.g., the tryptophan operon). What will be an ideal response?
Which of the following human diseases is caused by a virus that requires reverse transcriptase to transcribe its genome inside the host cell?
A) herpes B) AIDS C) smallpox D) influenza
All of the following are processes that occur during angiosperm reproduction EXCEPT
A) one megaspore degenerates, and the other three divide once to produce the six-celled embryo sac. B) the megaspore mother cell undergoes meiosis to produce four haploid megaspores. C) the tube cell produces the pollen tube. D) the generative cell forms two sperm cells via mitosis. E) the microspore mother cell undergoes meiosis to produce four haploid microspores.