One of the waste products that accumulates during cellular functions is carbon dioxide. It is removed via the respiratory system. What is another waste product that accumulates during normal physiological functions in vertebrates?
I) ammonia
II) uric acid
III) urea
A) only I and III
B) only II and III
C) only I and II
D) I, II, and III
Answer: D
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The hormone IAA helps plants to respond to and grow toward a light source by:
A) triggering release of growth factors at the tip of the stem. B) slowing growth under low light conditions. C) elongating cells on the opposite side of the shoot facing light. D) increasing mitosis on the side of the shoot facing light.
The markers that identify "self" are actually
A) genes. B) proteins. C) lipids. D) small surface bumps. E) triplet codons
Glucose is the most commonly used energy source by human cells because
A) this is the largest macromolecule available to cells for energy production. B) this monosaccharide yields the most energy of all macromolecules. C) fats and proteins yield too much energy for the cells to process. D) glucose is generally the most readily available substrate, derived from food or glycogen. E) no other macromolecule can be broken down enzymatically by cells to release energy.
The tRNA shown in the figure above has its end projecting beyond its end. What will occur at this end?
A) The amino acid binds covalently. B) The excess nucleotides (ACCA) will be cleaved off at the ribosome. C) The small and large subunits of the ribosome will attach to it. D) The cap of the mRNA will become covalently bound.