Filtering of blood and recycling of dead red blood cells are functions of the:
A) liver.
B) spleen.
C) pancreas.
D) kidneys.
Ans: B) spleen.
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Which of the following items can yield a significant amount of metabolic energy via cellular respiration?
What will be an ideal response?
Which of the following best describes the development of sexual structures in mammals?
A. Embryos develop male structures only once the SRY gene on the Y chromosome. becomes active; if SRY is not present, they develop female structures. B. Embryos initially develop female structures, but these degenerate and male structures develop once SRY becomes active. C. Embryos initially develop both male and female structures; once SRY becomes active, female structures degenerate and male structures continue to develop. D. Embryos initially develop male structures; if SRY is not present, these degenerate and female structures develop. If SRY is present, they continue to develop. E. None of these accurately describes the development of sexual structures in mammals.
In negative feedback, the variable being regulated is changed in the _______ direction, while in positive feedback the variable is changed in the ________ direction.
A. same, opposite B. decreasing, increasing C. negative, positive D. inhibitory, stimulatory E. opposite, same
For a plant, carbon and nitrogen are ________.
A) macronutrients
B) micronutrients
C) minerals
D) compost