Which of the following is the defining characteristic of the gymnosperms?
a. needle leaves
b. small female and large male cones
c. naked seeds
d. pollination by insects
c. naked seeds
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A normal event in the process of blood clotting is the _____
A) production of erythropoietin B) conversion of fibrin to fibrinogen C) activation of prothrombin to thrombin D) increase in platelets E) synthesis of hemoglobin
Imagine that you have isolated a yeast mutant that contains a constitutively (constantly) active histone deacetylase. What phenotype do you predict for this mutant?
A) The mutant will grow rapidly. B) The mutant will require galactose for growth. C) The mutant will show low levels of gene expression. D) The mutant will show high levels of gene expression.
In all reptiles, birds, and mammals, the processes of excretion, water and salt balance, and the regulation of pH in body fluids are controlled by the kidneys. This is an example of the organism maintaining
A. reabsorption B. homeostasis C. insulation D. hibernation
Do all ecological pyramids have a broad base with a smaller top?
A. Yes B. No