Which of the following allows for the earliest analysis of an embryo for a genetic disease?
1.fetoscopy
2.pre-implantation diagnosis
3.chorionic villus sampling
4.amniocentesis
2
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If you applied a toxin that blocked non-voltage-gated potassium channels (i.e., the potassium "leak channels") in a resting neuron, it would cause the membrane potential to be
A. less negative. B. more negative. C. No change would be observed.
Imagine an insect that is making its way from the outside of a tree to the inside of the tree. Put the layers that it would it encounter in order, starting with the outermost later.
a. Secondary xylem. b. Primary xylem and pith. c. Cork cambium. d. Cork. e. Remains of primary and older secondary phloem.
One function of the developing follicle is to ____
a. stimulate ovulation b. secrete progesterone c. secrete estrogens d. secrete gonadotropin-releasing hormone (GnRH) e. secrete glycoproteins, which promote sperm motility
Which one of the following is needed to synthesize a new strand of DNA?
A) lipids B) glucose C) amino acids D) nucleotides E) ribose