The coelacanth gave rise to the ____
a. ray-finned fish
b. chimaeras
c. tetrapods
d. dogfish
e. lungfish.
C
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Why is the destruction of helper T cells caused by HIV infection so crippling to adaptive immunity? What will be an ideal response?
A cell is in metaphase if:
a. the chromosomes are visible as threadlike structures. b. the nuclear envelope is clearly visible. c. the chromosomes are aligned at the midplane of the cell. d. the chromosome are separated into distinct groups at opposite poles of the cell. e. cytokinesis is occurring.
In humans, X-linked traits
a) occur on the X-chromosome b) are passed from fathers to their sons c) are more common than autosomal traits d) occur more frequently in females than males e) all of the above answer choices are correct
Addition of salts preserves foods because they
A. lower pH. B. increase osmotic pressure. C. create an isotonic environment. D. lower osmotic pressure.