Since there is a larger concentration of potassium ions inside a neuron, why is the inside of the neuron negative (-70mV) relative to the outside?
A. Potassium ions carry a negative charge.
B. Negatively-charged proteins inside the cell counteract the charge of the potassium ions.
C. The negative sign is just a historical convention.
D. The high concentration of sodium ions outside the cell makes the inside negative by comparison.
B. Negatively-charged proteins inside the cell counteract the charge of the potassium ions.
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The alternative pathways for viral infection—lytic and lysogenic—are determined by positive and negative regulatory effects of proteins produced by the virus following infection
A. true B. false
What is the path of urine from formation to excretion in the mammalian kidney?
A. collecting duct ? renal pelvis ? ureter ? urinary bladder ? urethra B. renal pelvis ? ureter ? urinary bladder ? urethra ? collecting duct C. ureter ? collecting duct ? renal pelvis ? urinary bladder ? urethra D. collecting duct ? ureter ? urinary bladder ? renal pelvis ? urethra E. urethra ? collecting duct ? renal pelvis ? ureter ? urinary bladder
Even though the phylogenetic lineages for hominins are not definitive, four of the following statements describe
possibilities. Which is NOT a possibility? a. Homo preceded Australopithecus. b. Homo sapiens is the most recent. c. Australopithecus is probably more ancient than Homo. d. Homo erectus preceded Homo sapiens. e. Chimpanzees and bonobos are the closest living relatives to modern humans.
Prader-Willi and Angelman syndromes are caused by which type of chromosomal mutations, both in connection with chromosome 15?
A) monosomy B) trisomy C) mosaicism D) uniparental disomy E) random X-inactivation