Vitamins play essential roles in cellular metabolism and are required in the diet.
Answer the following statement true (T) or false (F)
True
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During the resting state of a voltage-gated Na+ channel,
1. the inactivation gate is open. 2. the activation gate is closed. 3. the channel is permeable to Na+. a) 1 only b) 2 only c) 3 only d) both 1 and 2 are true. e) all of these choices are true.
MHC antigens are found only on the surface of leukocytes
Indicate whether the statement is true or false
Human egg and sperm are similar in that they ________
A) have the same degree of motility B) are produced in similar numbers each month C) have the same number of chromosomes D) are about the same size
Which of the following hormones is detected by over-the-counter pregnancy kits?
A. progesterone B. estrogen C. prolactin D. human chorionic gonadotropin E. oxytocin