Some genes such as that for ?-actin are expressed at relatively constant levels in tissues regardless of variations in the animal's condition. What do we call this type of gene?
A. transposable element
B. steady state gene
C. constitutive gene
D. recombinant gene
E. multifunctional gene
C. constitutive gene
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How can you determine the genotype of a plant showing the dominant phenotype of red color?
A. The phenotype reflects the genotype, so the plant must be homozygous for the trait. B. Cross the red plant with a white plant to see if any white plants appear. C. Cross the red plant with other red plants to see if any white plants appear. D. Cross the red plant with a white plant to see how many red plants appear. E. Cross the red plant with another red plant, and then cross the F1 population with each other to see if any white plants appear.
As early as the 1940s, researchers knew that bacteria could be grown in a minimal medium. In this
minimal medium the most common source of organic carbon is:
a. peptidase. b. glucose. c. rubisco. d. catalase. e. ammonium chloride.
The inhibition model of succession proposes that
A) early successional species modify the environment so that it becomes more suitable for later successional species. B) the first species to arrive make the site less suitable for later-arriving species. C) later successional species are neither inhibited nor aided by species of earlier stages. D) competition does not occur between early successional and late successional species.
The ________ are muscles of the rib cage that contract and therefore increase the size of the thoracic cavity during inhalation
Fill in the blank(s) with correct word