Cancer cells
1.have altered plasma membranes.
2.are unable to attach to other cells.
3.divide to produce a high density of cells.
4.form pseudopodia, enabling them to move about.
5.all of the choices
5
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A metabolic reaction requires 10 units of enzymatic activity to proceed. If a dominant allele D can generate 8 units of enzyme and a recessive allele d can generate 2 units of enzyme, what can be said of the dominant wild-type allele?
What will be an ideal response?
In echinoderms, gastrulation takes place through a primitive groove
____________________ Indicate whether the statement is true or false.
Nitric oxide is a signal molecule that can
a. bind to surface receptors and activate second messengers. b. bind to surface receptors and open ion channels. c. diffuse across cell membranes and bind to receptors that regulate transcription. d. diffuse across cell membranes and directly alter the activity of intracellular enzymes.
What is the effect of TSST-1 exotoxin on the body?
A) It causes red blood cell lysis. B) It damages the endothelial cells of capillaries. C) It binds to receptors on T cells and activates them. D) It is a pyrogen, causing fever. E) It kills epithelial cells of mucous membranes.