AP Biology Midterm Questions with Verified Solutions

AP Biology Midterm Questions with Verified Solutions A cell has the following molecules and structures: enzymes, DNA, ribosomes, plasma membrane, and mitochondria. It could be a cell from ______. a plant or animal A molecule with the chemical formula C6H12O6 is probably a _____. carbohydrate and monosaccharide only Besides the ability of some cancer cells to overproliferate, what else could logically result in a tumor? lack of appropriate cell death Binding of a signaling molecule to which type of receptor leads directly to a change in distribution of ions on opposite sides of the membrane? ligand-gated ion channel Chemical signal pathways _______________. often involve the binding of signal molecules to a protein on the surface of a target cell Cytokinesis usually, but not always, follows mitosis. If a cell completed mitosis but not cytokinesis, the result would be a cell with _____. two nuclei DNA is replicate at this time of the cell cycle: S Glucose diffuses slowly through artificial phospholipid bilayers. The cells lining the small intestine, however, rapidly move large quantities of glucose from the glucose-rich food into their glucose poor cytoplasm. using this information, which transport mechanism is most probably functioning in the intestinal cells? facilitated diffusion How can one increase the rate of a chemical reaction? add a catalyst If there are 20 chromatids in the cell, how many centromeres are there? 10 In general, a signal transmitted via phosphorylation of a series of proteins ____. brings a conformational change to each protein In the absence of oxygen, yeast cells can obtain energy by fermentation, resulting in the production of _______. ATP, CO2, and ethanol (ethyl alcohol) Large numbers of ribosomes are present in cells that specialize in producing which of the following molecules? proteins Once labor begins in childbirth, contractions increase in intensity and frequency until delivery. The increasing labor contractions of childbirth are an example of _____. positive feedback One difference between cancer cells and normal cells is that cancer cells ___________. continue to divide even when they are tightly