Pairs of chromosomes that have the same size, shape, and function are ________.
What will be an ideal response?
homologues
homologous chromosomes
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Microfilaments such as actin, microtubules, and the intermediate filaments form the cell-supporting structure called the:
A. cytoplasm. B. nucleus. C. plasma membrane. D. cytoskeleton.
Which mechanism would prevent interbreeding between two species of fish living in the same habitat?
a. sympatric isolating mechanisms b. allopatric isolating mechanisms c. equilibrium isolating mechanisms d. reproductive isolating mechanisms e. preadaptive isolating mechanisms
Alpha and beta interferons
A. help protect virus-infected cells from the effects of the pathogen. B. protect the cells that secrete them from being invaded by a virus. C. are produced by infected fibroblasts and macrophages. D. produce active antiviral proteins (AVPs) that coat the surface of healthy cells and prevent the attachment of pathogenic viruses. E. produce no adverse effects in the body.
Humans are unable to get metabolic energy from cellulose because:
A. cellulose contains very little chemical energy. B. cellulose is not part of a normal diet. C. cellulose digesting enzymes are absent from the human gut. D. cellulose does not taste good. E. cellulose is present in large quantities in the gut.