How many of the animal phyla include single-celled animals?
A. 0
B. 4
C. 2
D. 1
Answer: A
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When Avery and McCarty were attempting to identify the substance involved transferring hereditary material, they tested the ability of a bacterial S cell extract to transform R cells after different components of the extract were degraded by enzymes. Which treatment inhibited the ability of the S cell extract to transform R cells?
a. DNAse degrading enzymes b. RNAse degrading enzymes c. protein degrading enzymes d. lipid degrading enzymes e. amino acid degrading enzymes
The ability of a solution to resist changes in pH depends on its ____________________ capacity
Fill in the blank(s) with the appropriate word(s).
Within the epidermis of leaves are ________, through which gases, such as carbon dioxide and oxygen, pass.
A. stomata B. vessel elements C. trichomes D. root hairs
You have a concentrated stock solution of 10 M NaOH and want to use it to produce a 150 mL solution of 3 M NaOH. What volume of water and stock solutions will you measure out to make this new solution?
(a) 135 mL of water, 15 mL of NaOH stock (b) 115 mL of water, 35 mL of NaOH stock (c) 100 mL of water, 50 mL of NaOH stock (d) 105 mL of water, 45 mL of NaOH stock