Action potentials
a. can move up or down an axon, away from
or towards the cell body.
b. move in a one way direction towards the
cell body .
c. move in a one way direction away from the
cell body.
d. can jump from cell to cell.
e. do none of these.
C
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Archaea, Bacteria, and Eukarya are:
A. phyla B. kingdoms C. families D. domains E. orders
Recognition sequences for restriction enzymes possess the unique quality of being the same when read 5? to 3? on either strand. What is this property called?
A) origin sequence B) consensus sequence C) gene sequence D) recombination sequence E) palindromic sequence
Sickle cell anemia (a serious heritable disease) appears to be maintained via balancing selection in some Af-rican populations, because heterozygous carriers for the fully recessive disease allele are less affected by ma-laria parasites
Is this a case of antagonistic pleiotropy? a. Yes, the same allele has positive effects on one trait and negative effects on another trait. b. Yes, wild-type and sickle cell alleles have antagonistic effects. c. No, there is no time lag between the two traits (i.e., as in early vs. late acting). d. No, it involves a dominance interaction between the wild-type and the sickle cell allele.
Bioluminescent signals that fireflies and certain fishes send to distant receivers in the dark are classified as ____
signals.
a. tactile b. visual c. chemical d. electrical e. mechanical