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Questions in biology

[Homework Help] How much of an 800-gram sample of C-14 is left after 3 half-lives?

[Homework Help] Which of the bonding examples below is NOT possible? A. a DNA adenine to a DNA thymine B. a DNA adenine to an RNA thymine C. a DNA guanine to an RNA cytosine D. a DNA adenine to an RNA uracil E. a DNA guanine to a DNA cytosine

[Homework Help] Water that travels across land may pick up substances and become what?

[Homework Help] Approximately how many different journals (technical periodicals) comprise the primary literature of biology? A. 900 B. 9,000 C. 90,000

[Homework Help] Which of the following organisms is not in the phylum Echinodermata? a. brittle star b. lancelet c. sea star d. sand dollar

[Homework Help] People sweat to help maintain body temperature. What type of feedback happens when sweating regulates body temperature? A. Positive feedback, because sweating can increase body temperature B. Positive feedback, because sweating can decrease body temperature C. Negative feedback, because sweating can decrease body temperature D. Negative feedback, because sweating can increase body temperature

[Homework Help] The organelle that maintains pressure against the cell wall, so that the plant cell keeps its shape, is the: a. central vacuole. b. rough endoplasmic reticulum. c. smooth endoplasmic reticulum. d. nucleus.

[Homework Help] When do the sister chromatids line up at the equator of the cell? A. Metaphase B. Anaphase C. Prophase D. Telophase

[Homework Help] What is the Cell Theory, and why is it important?

[Homework Help] Why do plants need sap?