vA physician using a microscope to examine suspect cells in biopsy tissue would expect to find each of the following characteristics in metastatic cancer cells except
A) poorly differentiated cells.
B) many dividing cells.
C) perfectly spherical nuclei.
D) a poorly defined tumor boundary.
E) a high nucleus to cytoplasmic volume ratio.
Answer: C
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Amino acids that cannot be manufactured by the human body are called ____________________
Fill in the blank(s) with correct word
There are different versions of the gene that codes for fur thickness, one of which codes for
thicker fur and another that codes for thinner fur. In 1995, about 50 percent of the animals had thicker fur, and the other 50 percent had thinner fur. In the spring of 2012, after several years of low snow cover, 70 percent of the population had thicker fur, while only 30 percent had thinner fur. This change in the population is an example of
a. an adaptation. b. evolution. c. natural selection. d. homology.
Which is an example of temporal isolation?
A. two plant species have incompatible gametes. B. one plant species is pollinated by bees and a second plant species is pollinated by moths. C. two plant species live on the same mountainside, but one lives on rocky outcrops and the other in open meadows. D. one plant species blooms in June-July and a second plant species blooms in August-September.
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.