Provide a brief argument for the following statement: “single-celled protists are complex”
What will be an ideal response?
ANSWER: There are a number of intracellular structures in some single-celled protists, and some of
these structures are not found in any other living organisms. The cell must carry out all of
the functions of the organism, and this is often controlled by specialized structures. For
example, a single-celled protist may control water movement in and out of the cell
(contractile vacuole), digest prey (food vacuoles), and move (flagella, pseudopodia, or
cilia).
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Cleft palate is ____
a. controlled only by genetics b. a continuously distributed trait c. controlled by a single gene pair d. only transmitted from father to son e. explained by the threshold model of complex traits
The tonoplast is another name for
a. the plant nuclear envelope. b. a chloroplast. c. the cell wall. d. an undifferentiated plastid. e. the vacuolar membrane.
Which of the following pairs of terms is NOT matched appropriately?
a. primary consumer ? carnivore b. primary consumer ? herbivore c. primary producer ? autotroph d. primary producer ? plant e. secondary consumer ? carnivore
Nitrogen has an atomic number of 7. How many
hydrogen atoms are necessary to join with the nitrogen to form a stable compound? a. 1 b. 2 c. 3 d. 4 e. 5