What is the fate of the majority of the water in xylem sap?
a. It evaporates into the air.
b. It is used to make sugars.
c. It is used in capturing light energy.
d. It becomes part of new plant cells.
Ans: a. It evaporates into the air.
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A cohort study looks at
A) a large group of people over time, keeping track of specific health conditions or measures. B) large groups of DZ and MZ twins. C) heritabilities of behavioral characteristics. D) patterns of copy number variants in the human genome.
H. V. Wilson worked with sponges to gain some insight into exactly what was responsible for holding adjacent cells together
He exposed two species of differently pigmented sponges to a chemical that disrupted the cell-cell interaction (cell junctions), and the cells of the sponges dissociated. Wilson then mixed the cells of the two species and removed the chemical that caused the cells to dissociate. Wilson found that the sponges reassembled into two separate species. The cells from one species did not interact or form associations with the cells of the other species. How do you explain the results of Wilson's experiments? A) The two species of sponge had different enzymes that functioned in the reassembly process. B) The molecules responsible for cell-cell adhesion (cell junctions) were irreversibly destroyed during the experiment. C) The molecules responsible for cell-cell adhesion (cell junctions) differed between the two species of sponge. D) One cell functioned as the nucleus for each organism, thereby attracting only cells of the same pigment.
Blood plays an important role in homeostasis.
Answer the following statement true (T) or false (F)
Which of the following is a characteristic by which viruses are classified?
A. type of nucleic acid B. type of life cycle C. number of chromosomes D. type of host E. size