Changes in gene expression that are not the result of changes to the gene itself are known as ________ changes.

Fill in the blank(s) with the appropriate word(s).


epigenetic

Biology & Microbiology

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According to the acid-growth hypothesis, auxin causes increased acidity in cell walls, which then activates ____ that

disrupt(s) bonds between cellulose microfibrils, allowing cell expansion.

a. a membrane potential b. AUX1 transporters c. proteins called expansins d. an mRNA e. K+ ions

Biology & Microbiology

What are the steps toward multicellularity, in the correct order?

A. Some cells become gametes, then a colony forms, and finally some cells start to specialize. B. Some protists start to specialize for specific tasks, then they form a colony with specialists, and finally some specialists become gametes. C. First a colony of protists forms, then some become gametes, and finally others specialize in various tasks. D. First a colony of protists forms, then some protists start to specialize in specific tasks, and finally some cells become gametes.

Biology & Microbiology

A paracentric inversion heterozygote contains a normal chromosome with the long-arm gene order GENE and an inverted chromosome with the long-arm gene order GNEE. They form an inversion loop to pair during prophase I of meiosis

If a single crossover occurs between the G and the E segments of the loop, what will be the gene orders in the resulting recombinant dicentric chromosome and acentric fragment? Assume crossing over occurs at the four-strand stage involving two nonsister chromatids.

Biology & Microbiology

The cytoplasmic membrane of bacteria ________.

A. acts as a selectively permeable barrier, allowing some molecules to pass while preventing the movement of others B. retains the cytoplasm and its contents C. is the major site of ATP synthesis in aerobes D. All of the choices are correct.

Biology & Microbiology