Cycliophorans have two types of larvae. One type of larva is produced when the digestive system of a female is impregnated by a male. The digestive system then collapses and develops into a larva, which swims away in search of a new host after the surrounding female dies. Which is the embryonic tissue that is apparently most important in forming this type of larva?
Ans: endoderm
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Choose the answer that correctly lists, in chronological order, the events involved in synaptic transmission
a: A nerve impulse reaches the synaptic knob. b: Neurotransmitter molecules diffuse across the synaptic cleft. c: A nerve impulse begins in the postsynaptic cell. d: Neurotransmitter molecules bind to receptors in the postsynaptic cell. e: A voltage change occurs in the postsynaptic cell. A. a, c, b, d, e B. a, b, e, d, c C. c, b, d, e, a D. a, b, d, e, c E. c, a, b, d, e
Fred's blood was determined to be AB positive. What does this mean?
A) There are no antibodies to A, to B, or to Rh antigens in the plasma. B) He can only receive blood from a donor who is AB positive. C) Antibodies to A and B are present in the red cells. D) His blood lacks Rh factor.
Apoptosis begins with a cell's receiving a signal to die
Indicate whether the statement is true or false
All of these muscles, except one, adduct the arm. Select the exception.
A. Triceps brachii B. Infraspinatus C. Coracobrachialis D. Supraspinatus E. Teres minor