A patient complains that his teeth are loose and his gums bleed easily. The doctor believes that due to poor diet, the patient has scurvy, a vitamin C deficiency. Vitamin C is required to produce collagen which provides mechanical and structural support for tissue. This structural support is known as the:
What will be an ideal response?
extra cellular matrix
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Answer the following statements true (T) or false (F)
1. The bicoid gene is a homeotic gene that encodes a transcription factor. 2. Both embryonic stem cells and embryonic germ cells are pluripotent. 3. A myeloid progenitor cell can differentiate into immune cells of the blood and lymph systems. 4. Davis, Weintraub, and Lasser demonstrated that MyoA, MyoD, and MyoH could transform undifferentiated fibroblast cells into muscle cells. 5. There are no federal government funds currently available for stem cell research.
Explain the significance of what Loewi observed in his experiment with the two frog hearts.
A. It showed that neurons communicate with muscle by electrical signals. B. It suggests that a chemical substance released from the first heart, when added to the second heart, reproduced the effects of electrical stimulation. C. It suggests that all vertebrate hearts receive both inhibitory and excitatory signals from different nerves. D. It showed that nerves have a direct electrical effect on heart muscle.
Muscle that is not striated and is involuntary is ____
a. cardiac only b. skeletal only c. smooth only d. both cardiac and skeletal e. both cardiac and smooth
Amniocentesis involves sampling
a. the fetus directly. b. the fetal cells floating in the amniotic fluid. c. sperm. d. blood cells. e. placental cells.