The xylem and phloem are produced by the
A. vascular cambium.
B. sieve tube.
C. vascular bundle.
D. mycorrhizal fungi.
E. companion cells.
Ans: A. vascular cambium.
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Which of the following statements is TRUE of small effector molecules?
A. Small effector molecules cause a conformational change in a regulatory protein. B. Small effector molecules can prevent a repressor from binding a gene region. C. Small effector molecules regulate gene transcription. D. Small effector molecules regulate gene transcription by binding a regulatory protein. E. All of the choices are correct.
The primers in PCR are
a. fragments of mRNA. b. designed to base pair with mRNA. c. free nucleotides. d. radioactive. e. none of these
Which of the following is the correct evolutionary sequence?
A. birds ? reptiles ? fish ? amphibians B. fish ? birds ? amphibians ? reptiles C. reptiles ? birds ? fish ? amphibians D. amphibians ? fish ? reptiles ? birds E. fish ? amphibians ? reptiles ? birds
Only mutations in __________ cells matter in terms of evolution because they can be inherited by the offspring.
Fill in the blank(s) with the appropriate word(s).