Internal fertilization is more advantageous than external fertilization because:a
internal fertilization permits cross-species fertilization.
b. internal fertilization is more open to chance.
c. internal fertilization produces a motile egg.
d. internal fertilization increases the life span of gametes.
e. internal fertilization provides a protective environment for gamete fusion.
e
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What is the underlying molecular cause of Crohn’s disease?
a. B cells are mutated and do not release antibodies. b. Receptor proteins are mutated and cause an abnormal immune response. c. Helper T cells are inactivated. d. Mucus is not released from epithelial tissues. e. Antigen-presenting cells are absent.
Which of the following substances is completely reabsorbed by the proximal convoluted tubules when it is at normal levels in the blood?
A. sodium B. potassium C. glucose D. water E. All of the above are completely reabsorbed by the proximal convoluted tubule.
You are studying the function of a recently identified gene in C. elegans. You perform genetic screens for several months in an attempt to isolate loss-of-function gene mutations, but your efforts are unsuccessful. Your advisor suggests you try another approach to eliminate gene function. The best technique to accomplish this goal would be
A. use a C. elegans strain with a homozygous TFIID mutation to prevent the translation initiation complex from forming. B. use RNA interference to prevent mRNA translation. C. to design a repressor to bind to the operon of this gene. D. use a histone deacetylase to induce a transcriptionally inactive state.
To be an effective antibiotic or chemotherapeutic agent, it is necessary
Select one: a. not to kill the human host or cause allergic reactions. b. to be able to kill a bacterial cell only. c. not to kill the human host or cause allergic reactions AND to be able to kill a bacterial cell only. d. to change the genome of the bacterial disease agent. e. to stop any universal living cell process.