1. the endoplasmic reticulum and golgi apparatus are both membrane-bound organelles found in eukaryotic cells. which statement describes one way in which the endoplasmic reticulum and golgi apparatus work together?
a) the golgi apparatus assembles proteins, and the endoplasmic reticulum modifies and packages them.
b) the endoplasmic reticulum assembles mrna molecules, and the golgi apparatus translates them into proteins.
c) the golgi apparatus assembles mrna molecules, and the endoplasmic reticulum translates them into proteins.
d) the endoplasmic reticulum assembles
2. the mitochondria in eukaryotic cells is most similar in function to which of the following?
a) military base
b) power plant
c) factory
d) drawbridge
3. a group of students was asked to list some of the similarities and differences between prokaryotic cells and eukaryotic cells. they created the table shown above. the students made a mistake in creating their table. which statement best describes their mistake? (points : 2)
a) prokaryotic cells possess cytoplasm, while eukaryotic cells do not.
b) both prokaryotic cells and eukaryotic cells possess a nucleus.
c) both prokaryotic cells and eukaryotic cells are enclosed by a plasma membrane.
d) eukaryotic cells possess ribosomes, while prokaryotic cells do not.

How many species of living things are alive on earth today? more than 1,000,000 none of these answers are correct 100-500 1,000 –500,000 o 500,000 -1,000,000

Experiments in environmental toxicology can sometimes be manipulative experiments in which the researcher actively chooses and manipulates the independent variable. in hunt's study, for example, dosages of bpa were manipulated and the effects were measured. in manipulative studies, the researcher controls all the other variables in the experiment, so any health effects observed in the test subjects can be attributed to differences in the independent variable. in other cases, researchers use natural experiments in which the dependent variable (typically a measure of organism health) is measured under differing contexts that are not manipulated. say, for example, that an accidental chemical spill contaminates five ponds. to determine the possible effects of the toxic chemical on frogs, a researcher could compare the hatching rate of frog eggs laid in those five ponds to the hatching rate of eggs laid in five uncontaminated ponds nearby. this would be an example of a natural experiment because concentrations of the toxic chemical in the ponds were not controlled by the experimenter, but rather resulted from the chemical spill. drag type of experiment on the left to the example of experiment on the right. blood concentrations of bpa in college students are compared to their recent manipulative consumption of canned food items 2. the feeding behavior of fish in streams that receive acidic runoff from strip mines is compared to the feeding behavior of fish in unaffected streams. the deformity rate in baby birds from nests in pesticide-sprayed fields is compared to the deformity rate in birds from nests in unsprayed fields 4 tumor development is compared in mice exposed to five dosages of a known carcinogen in the laboratory foraging activity levels are compared in tadpoles exposed to four concentrations of toxic metals in the laboratory. growth of corn plants is compared in field plots sprayed with three different dosage: s of weed killer 7 bpa concentrations in the urine of people with diabetes are compared to bpa concentrations in the urine of people without diabetes - natural; manipulative

Which of the following was a characteristic of a dromaeosaur? modified front claw grasping with their forelimbs both a and b none of the above