In a drug trial investigating the effects of a new drug, neither the research scientists nor the participants know if they are in the treatment or the control group. What does this type of study design control for?
A) experimenter bias
B) extraneous variables
C) placebo effect
D) spurious correlations
E) non-random assignment
A) experimenter bias
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The cell walls of fungi are made up of polysaccharides including
A. polyglycans. B. phospholipids. C. bilipid layers. D. glycolipids. E. chitin.
What is the deep scattering layer? How was it discovered? What organisms commonly compose this layer?
What will be an ideal response?
Which organelle increases in size, causing plant cells to elongate?
a. chloroplast b. mitochondrion c. nucleus d. ribosome e. vacuole
You are told that the cells on a microscope slide are plant, animal, or bacterial. You look at them through a microscope and see cell walls and membrane-bound organelles. You conclude correctly that the cells
A) are plant cells. B) are animal cells. C) are bacterial cells. D) could be either plant or bacterial cells.