From which cellular component do cilia and flagella arise?
a. the chromosome
b. the centriole
c. the nucleus
d. the Golgi complex
Ans: b. the centriole
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Which of the following is not a characteristic of Bicoid protein?
A. Bicoid is a maternal gene product. B. Throughout the first seven nuclear divisions, Bicoid concentration is higher in the anterior pole than the posterior pole. C. Bicoid represses Hunchback in the posterior pole. D. Bicoid is a transcriptional activator of many segmentation genes.
Which of the following is NOT true of chlorofluorocarbons?
a. They can destroy ozone. b. They are odorless. c. They are a greenhouse gas d. They break down very slowly. e. Their action is allowing more UV radiation through the atmosphere
Pseudocoelomate nematodes lack a body cavity.
A. Correct, they are solid from the gut to the cuticle. B. Incorrect, their body cavity is fully enclosed by ectoderm but is a functional body cavity. C. Incorrect, although not fully enclosed by mesoderm, the pseudocoel is a body cavity. D. Correct, their pseudocoel does not allow for the development and expansion of organs.
What type of tissue contracts and accounts for movements of organs or the entire body?
A. nervous tissue B. epithelial tissue C. muscle tissue D. connective tissue