Apicomplexan organisms such as Plasmodium possess a motile, infective stage called the ________.
A. trophozoite
B. sporozoite
C. apizoite
D. None of the choices are correct.
Answer: B
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How can organisms with the same phenotype have different genotypes and vice versa, and what is the
significance?
What will be an ideal response?A population reaches a stable-age distribution when the
A) population stops growing. B) birthrate is less than the death rate. C) net reproductive rate (R0 ) is zero. D) proportion of individuals in each age group remains the same.
Cellular structures that function in movement and consist of numerous short hairlike extensions from the cell are called ________
Fill in the blank(s) with correct word
The MyoD transcriptional regulator is normally found in differentiating muscle cells and participates in the transcription of genes that produce muscle-specific proteins, such as those needed in contractile tissue
Amazingly, expression of MyoD in fibroblasts causes these cells derived from skin connective tissue to produce proteins normally only seen in muscles. However, some other cell types do not transcribe muscle-specific genes when MyoD is expressed in them. Which of the following statements below is the best explanation of why MyoD can cause fibroblasts to express muscle-specific genes? (a) Unlike some other cell types, fibroblasts have not lost the muscle-specific genes from their genome. (b) The muscle-specific genes must be in heterochromatin in fibroblasts. (c) During their developmental history, fibroblasts have accumulated some transcriptional regulators in common with differentiating muscle cells. (d) The presence of MyoD is sufficient to activate the transcription of muscle-specific genes in all cell types.