Mendel kept detailed records of the genetic traits of parent plants and their offspring plants. Among observations, he found that some traits were not expressed, whenever one particular allele was present. He referred to these traits as masked traits, or
A. recessive traits.
B. heterozygous traits.
C. homologous traits.
D. dominant traits.
E. homozygous traits.
D. dominant traits.
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If the gp120 glycoprotein were damaged as a result of a mutation, HIV would have difficulty:
A. binding to a host cell B. leaving a macrophage C. inserting its genes into the host cell's genome D. assembling the capsid E. attaching its RNA to a host cell's ribosome 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 HIV infection? Choose Answer · Given what you now know, what information and/or problem solving approach 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 event of fertilization occurs first?
A. fast block to polyspermy B. the entry of sperm DNA into the egg C. the slow block to polyspermy D. the acrosomal reaction E. the cortical reaction
The most primitive plants are the
A. ferns. B. flowering plants. C. mosses. D. pines.
Information obtained by Franklin from X-ray crystallography on DNA suggested that it is shaped like a
A. hollow cylinder. B. pleated sheet. C. icosahedron. D. helix. E. ribbon.