Which of the following represents a loss of nutrients from an aquatic ecosystem?
A) leaves falling into a stream
B) fish feeding on surface insects
C) tadpoles metamorphosing out of the water
D) shredding insects breaking down leaf litter
C
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Which of the following is not one of the diagnostic criteria for ASDs?
A) impairments in social behavior B) impairments in communication C) aggressive behaviors D) repetitive behaviors
Which of the following types of RNA is typically found as a strand that is about 75 to 90 bases long and folds into a structure with four double-helical segments?
a. tRNA b. snRNA c. pre-mRNA d. rRNA
Cells that have undergone a response that causes them to enter a permanent state of growth arrest, like those that comprise a mole are said to have entered a state called
a) adolescence b) senescence c) pubescence d) bellioscosityb) senescence
What is the main function of the nucleolus?
A) It produces enzymes that are then exported to the lysosomes. B) It produces cell adhesion proteins that are then exported to the cell membrane. C) It is the site of ribosome-subunit synthesis. D) It is the site of photosynthesis in photosynthetic cells. E) It is the site of cellular waste digestion and recycling.