What links the two strands in a DNA helix together in the middle?

A. Phosphate groups

B. Sugar rings bonded together

C. Proteins

D. Bases with hydrogen bonds

A culture of E. coli is grown on minimal medium plates supplemented with either tryptophan, histidine, or lysine. The resulting colonies are replica plated to three minimal medium plates containing no supplements.

Which laboratory test indicates the proportion of the blood sample that is red blood cells?

Selectively permeable membranes allow only certain materials to pass through them. t/f?

Specific germs cause specific diseases. a. True b. False

If a rainforest had drastically less rain for many years, what biome would it become?

Genes that have more than two alleles are epistastic. multiple allelic. autosomes. none of the above

What are the three main parts of the scientific process? a) predicting, inferring, and drawing conclusions b) activating knowledge, and inferring c) observation, experimentation, and scientific d) data collection, analysis, and hypothesis formation

A calorie is also referred to as a?

List four possible methods for sterilizing ballast

Mitochondria are the ___ of the cell