In a scientific experiment, a control group
a) is less important than an experimental group
b) makes the experiment better, but is not essential
c) can be compared with an experimental group to assess whether one particular variable is causing a change in the experimental group
d) must be kept in a laboratory
Ans: c) can be compared with an experimental group to assess whether one particular variable is causing a change in the experimental group
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You determine the amino acid sequence of a protein and find it contains a long sequence of methionine, followed by a long sequence of proline, followed by a long sequence of valine
Using these data you predict the sequence of this protein's secondary structure will be _____. A) beta sheets, then a region of no secondary structure, then beta sheets B) alpha-helices, then a region of no secondary structure, then alpha helices C) beta sheets, then a region of no secondary structure, then alpha-helices D) alpha-helices, then a region of no secondary structure, then beta sheets
Which of the following comparisons between gap junctions and plasmodesmata is NOT true?
A. Both allow exchange of material between cells, but gap junctions allow larger-sized molecules to transfer between cells. B. Animal cells have gap junctions, and plant cells have plasmodesmata. C. In plasmodesmata, the plasma membranes of the connected cells are continuous, while in gap junctions, the plasma membranes of the connected cells remain distinct. D. Gap junctions connect cells directly at the plasma membranes, but plasmodesmata must also bridge the cell wall separating the two cells. E. All of the above statements are true.
The cell wall is a common feature to
_____ prokaryotic cells only. _____ plant cells only. _____ animal cells only. _____ prokaryotic and plant cells. _____ all cells.
Which of the following is an example of a condition due to a chromosome structural abnormality?
a. muscular dystrophy b. sickle cell anemia c. Down syndrome d. cri du chat