Among the six steps of the scientific method, the first step involves:
A. gathering market data.
B. asking a question.
C. writing up the results.
D. writing a grant proposal.
Answer: B
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Genes under positive control are ____
a. off until they are turned on b. always expressed
c. expressed unless a repressor protein is present d. controlled by several promoters to increase transcription e. regulated by feedback inhibition
Which property is not common to all living things?
1.DNA is found inside a nucleus. 2.DNA directs growth and reproduction. 3.The ability to obtain nutrients and energy. 4.The ability to detect and respond to internal and external changes.
Which muscle is the antagonist of the quadriceps femoris group?
a. hamstrings b. gluteus maximus c. sartorius d. gastrocnemius e. tibialis anterior
Identical copies of each chromosome are called ________ and are joined at the ________.
A. homologues; centromere B. sister chromatids; centromere C. sister chromatids; kinetochore D. homologues; kinetochore