Which substance can enter a cell by diffusion without having to be digested?

A. water
B. protein
C. starch
D. fat


Answer: A. water

Biology & Microbiology

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In which of the following tissues would one expect to see a lot of tight junctions?

a. red blood cells b. kidney glomeruli c. epithelial tissue of the urinary bladder d. alveoli in the lungs

Biology & Microbiology

Because all eukaryotic cells must carry out certain functions to maintain life processes, these cells contain similar structural components, regardless of the organism from which they come.

a. true b. false

Biology & Microbiology

All crocodilians

a. live in or near water. b. are predators with sharp teeth. c. have a four-chambered heart. d. have powerful jaws. e. fit all of these descriptions

Biology & Microbiology

The steps of the scientific method, in the correct order, are

A) design experiments, draw conclusions, collect data, interpret results, make observations, and test the hypothesis. B) make observations, formulate the hypothesis, design experiments, collect data, interpret results, and draw conclusions. C) collect data, interpret results, test the hypothesis, design experiments, make observations, and draw conclusions. D) collect data, interpret results, test the hypothesis, make observations, and design experiments. E) none of the above.

Biology & Microbiology