A molecule inside a cell consists of over 3,500 covalently linked atoms weighing about 105,000 daltons. From this description, the molecule can most specifically be described as a
A) macromolecule.
B) polysaccharide.
C) lipid.
D) polypeptide.
E) protein.
Ans: A) macromolecule.
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Which of the following substances is secreted by an endocrine gland?
a. Tears b. Breast milk c. Wax d. Saliva e. Hormones
Toxic dinoflagellates can directly harm other organisms during bloom periods by secreting their toxins in the water or by being consumed and concentrated in the tissues of filter-feeding organisms. Can you think of ways in which blooms of non-toxic dinoflagellates may harm other organisms in the water?
What will be an ideal response?
What is released into the neuromuscular junction to produce a muscle contraction?
a. calcium b. acetylcholine c. potassium d. sodium e. chloride
DNA sequencing data suggest that evolutionary changes are related to an accumulation of:
a. index fossils. b. vestigial organs. c. convergent structures. d. homologous structures. e. changes in DNA nucleotide sequences.