Answer the question using the accompanying figure. The animal labeled "E" is a ____
a. mosquito of the genus Aedes
b. mosquito of the genus Anopheles
c. mosquito of the genus Culex
d. fly of the genus Musca
e. tick of the genus Amblyoma
ANSWER: b
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Which of the following is not a virulence factor associated with helminths?
A. Thick cuticle to escape detection from the host immune system B. Secretion of toxins C. Degradative enzymes to damage host tissue D. Specialized structures for attachment to host tissues
Which plants resemble palm trees (but are not close relatives), and contain toxins that increase the risk of neurodegenerative disorders and cancer?
a. tree ferns b. conifers c. gnetophytes d. ginkos e. cycads
If you were looking at a cell under a powerful microscope, what would tell you that it is a eukaryotic cell?
A) It has ribosomes. B) It has DNA. C) It has a nucleus. D) It is moving.
Imagine that you are conducting an experiment on an enzyme known as sucrase. This enzyme is synthesized and used by yeast cells to break down the disaccharide sucrose (table sugar) into the monosaccharides glucose and fructose
You decide to conduct an experiment to test whether the sucrase enzyme can break down the artificial sweetener sucralose. Sucralose (a "chlorinated" carbohydrate) has some chemical similarity to sucrose, but is different in that three of its hydroxyl groups are missing and replaced with chlorine atoms instead. Based on the details provided in this scenario, do you think the sucrase enzyme will be able to interact with sucralose? A) Yes; enzymes such as sucrase are not specific for their substrate. B) Yes; the enzymes in human cells can interact with artificial sweeteners as if they were sugars. C) No; sucralose is an ion and not a true carbohydrate. D) No; all enzymes are highly specific and can react with only a specific substrate.