A culture in a closed vessel to which no additional medium is added and from which no waste products are removed is called a ________ culture.

A. semicontinuous
B. continuous
C. batch
D. fed-batch


Answer: C

Biology & Microbiology

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Which of the following problems can arise during posttranscriptional control?

A. Excising an exon from the pre-mRNA strand. B. Incomplete excising of all introns from the pre-mRNA strand, leaving fragments to be joined with the exons. C. Differential splicing of exons that can lead to an altered gene expression. D. All of these are errors that can occur during posttranscriptional control of gene expression.

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Leaky-barrel model

What will be an ideal response?

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Populations of roses that have different gene frequencies from one another are 

A. clones. B. hybrids. C. varieties. D. communities.

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Which of the following statements best exemplifies the principle of selective pressures?

a. the environmental pressures felt by selection b. the environmental pressures felt by populations c. the environmental pressures felt by species d. the environmental pressures felt by organisms

Biology & Microbiology