Which of the following statements regarding coenzymes is true?
A. they are essential for metabolic reactions in animals but not in plants
B. They can facilitate metabolic reactions by combining with enzymes at their active sites
C. They are minerals that alter the pH of cells and thus increase the probability of chemical reactions
D. They are synthesized in the rough endoplasmic reticulum of eukaryotic cells.
E. They typically work best at temperatures below 37C
Ans: B. They can facilitate metabolic reactions by combining with enzymes at their active sites
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The innate response resists a particular foreign agent; moreover, innate immune responses improve on repeated exposure to the agent.
Answer the following statement true (T) or false (F)
Which of the following adds RNA nucleotides,
one at a time, during transcription?
a. RNA polymerase b. DNA polymerase c. RNA nuclease d. transfer RNA e. ribosomal RNA
In snapdragons, there is an allele for flower color, CW, that produces no pigment. A plant with the genotype CWCW will produce _____________ flowers.
a) no b) red c) white d) black e) pink
Many commercial pesticides become less effective after two to three years because:
A) the chemicals mutate. B) pests with resistant genes will survive and reproduce. C) new pests invade the area. D) pests without resistant genes will ignore any plant coated with pesticide.