Which organelle is a network of membranes involved in the production of proteins?
A) chloroplast
B) endoplasmic reticulum
C) lysosome
D) nucleus
B
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The fossil record shows that the jawed fishes called ____ diversified in the Devonian and
Carboniferous periods, but they left no direct descendants. Their heads were covered with large, heavy plates of bone, and their jaws had sharp cutting edges.
a. acanthodians b. conodonts c. osteolepiforms d. placoderms e. ostracoderms
Biofilm bacteria are beneficial in their
A) accumulation and attachment to damaged tissues in the human body. B) involvement in nutrient exchange between microbes and plant roots. C) invasive penetration of cooling towers and storage tanks. D) accumulation on hard surfaces such as teeth.
Patients with damage to Wernicke's area have difficulty _____
A) generating speech B) recognizing faces C) understanding language D) experiencing emotion
When using a microscope to view cells you obtained from scraping under your fingernails, you notice that the cells lack nuclei; therefore, you conclude that the cells must be a type of ________ cell.
A) plant B) eukaryotic C) fungal D) prokaryotic