Waste products that contain nitrogen are produced by cells as the metabolize ____.
Fill in the blank(s) with the appropriate word(s).
Answer: proteins
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The model of life's origins, which posits that all of the necessary ingredients for the origin of life were present on early Earth, has been named after two early twentieth-century scientists. This model is called the ________ [two words] model
Fill in the blank(s) with correct word
Which of the following statements about hydrostatic skeletons is true?
a. Compression of fluids causes movement of an animal body. b. Hydrostatic skeletons permit very precise and delicate movements. c. Fluid is moved throughout an organism due to alternating contractions of antagonistic muscles. d. Contraction of the inner circular muscles causes the body of an organism to shorten. e. Contraction of the outer longitudinal muscles causes the body of an organism to lengthen.
Plants, like animals, grow at all points of their body. Indicate whether the statement is true or false
Which of the following organelles is correctly matched with its function?
(A) Lysosome . . lipid hydrolysis (B) Nucleolus . . protein synthesis (C) Ribosome . . carbohydrate synthesis (D) Mitochondrion . . Calvin cycle