If there are 4 nitrogen bases and they are read in groups of three, how many codons are possible?

What is the maximum number of atoms that a carbon atam can bond with in an organic compound?

Two planets with the same mass and atmospheric conditions orbit a single star. Planet A is closer to the star than Planet B.

Earth is made mostly of metals and rocks. where did this material come from?

Give 2 ways that exposing non-pathogenic bacteria to antibiotics as a side effect of antibiotic treatment for a pathogen may increase the spread of resistance.

Which factor can affect the rate of photosynthesis by denaturing enzymes in the plant?

Chargaff's rules how do they work and where

12. A (n) _ is an underground reservoir of water that is over- lain by impermeable rock units. a. aquiclude c. confined aquifer b. aquifer d. unconfined aquifer

Which event would probably NOT occur if all of the decomposers could be removed from a temperate forest ecosystem? A) Discarded leaves and dead animals would pile up. B) Plants would benefit, from decreased competition with mushrooms.

In a classic experiment that demonstrated the semiconservative nature of DNA replication, cells were grown first in 14N-containing media and later in 15N-containing media, and DNA was separated by

Which of the following is in the correct order from smallest to largest? A. tissue-organ-system-cell B. cell-organ-tissue-system C. System-tissue-cell-organ D. cell-tissue-organ-system