Many cancers can be identified based on microarray analysis of _____
a. signature genes
b. genes in red blood cells
c. mitochondrial DNA
d. Y chromosome DNA
e. DNA probes
ANSWER: a
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In the experiment by Davis et al., only fibroblast cells that took up the cloned myoD gene differentiated into muscle cells. This is because
A. only those cells contained muscle-cell-specific enhancer sequences. B. MyoD is a transcription factor that turned on muscle-specific genes such as myosin C. MyoD is a transcription factor that shut off fibroblast specific genes, allowing the muscle cell characteristics to show up D. MyoA and MyoH are transcription factors that shut off muscle-specific genes E. myoD is the gene for myosin and the presence of myosin converts the fibroblast into a muscle cell
Cells that produce the pigment found in the epidermis are called
a. Granstein cells. b. keratinocytes. c. melanocytes. d. Langerhans cells. e. adipose cells.
Which organelle would you expect to find in plant cells but not animal cells?
A. mitochondrion B. ribosome C. chloroplast D. smooth endoplasmic reticulum
You are a doctor that specializes in diseases such as sickle cell. Which of the following do you study?