In response to injury, cell fragments called platelets get activated to induce clotting. Activated platelets release factors that can in turn bind to specific membrane receptors on nearby cells. What type of signaling would this be considered?
A. Direct contact
B. Paracrine
C. Endocrine
D. Synaptic
E. Autocrine
B. Paracrine
Since the factors are acting on cells in the local environment, this is an example of paracrine signaling.
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How many copies of each gene are present in these skin cells at G2 of interphase?
A. 2 B. 4 C. 6 D. 8
When you feel threatened, the neurotransmitter norepinephrine is released from the adrenal gland in response to
stimuli by ____ neurons.
a. somatic b. sensory c. sympathetic d. motor e. parasympathetic
Which of the following statement is correct?
A. Transcription is the process of making RNA. B. Transcription is the process of making DNA. C. Translation is the process of making RNA. D. Translation is the process of making DNA
Optometrists, who help patients with their vision problems, know that certain types of repetitive use of the muscles around the lens of the eye can "train" the lens to become flatter than normal
This often occurs in truck drivers, sailors, and other people who focus on the horizon or at great distances for long periods of time. What would be the consequence of this on the eye over a long time period? A) Nearsightedness B) Farsightedness C) Complete blindness D) Color-deficiency