A linear stretch of DNA that specifies the sequence of amino acids in a polypeptide is called a(n)
a. codon.
b. intron.
c. messenger.
d. gene.
e. enzyme.
D
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As part of their reproductive cycle, helminths produce egg and sperm cells. Both of these eukaryotic cell types have an outer surface composed of polysaccharides known as the ________.
A. microtubule B. cell wall C. glycocalyx D. cyst E. cell membrane
The kidneys are both protected and held in place by cushions of fat. In cases of rapid weight loss, the kidneys may drop to a lower position, possibly causing kinks in a nearby tubular organ. If this happens, urine will back up into the kidneys, severely damaging them. What organ(s) is/are most-likely kinked in this situation?
A. urethra B. renal arteries C. ureters D. renal veins E. nephrons Clarify Question What is the key concept addressed by the question? What type of thinking is required? Gather Content What do you already know about urine flow from the kidney? What other information is related to the question? Choose Answer Given what you now know, what information is most likely to produce the correct answer? Reflect on Process Did your problem-solving process lead you to the correct answer? If not, where did the process break down or lead you astray? How can you revise your approach to produce a more desirable result?
Which cells target parasites and worms?
a. eosinophils b. B and T cells c. macrophages d. phagocytes e. cytokines
Which of the following is a property of water?
A) it has a high capacity for heat. B) it is not a common reactant in metabolic reactions. C) It is not a good solvent. D) it is liquid in a very narrow temperature range. E) it is a nonpolar molecule.