In a DNA molecule, which of the following forms a base pair with thymine?

O

A. Cytosine

O

B. Adenine

O

C. Guanine

O

D. Thymine

Biology Bob is angry that Chemistry Carl has sent a vase of red roses to his girlfriend, Phyllis Physics. Bob dumps 10% saltwater into the vase. Rose cells have about 1% salt inside.

What is a microorganism [a microbe] that is innocuous [not harmful] to man or to a given animal species? It is a living being which does not possess the capacity to multiply in our body or in the body of the animal.

Why is Earth an example of a system?

Monarch butterflies are protected from birds and other predators because of cardiac glycosides they incorporate into their tissues from eating milkweed when they were in their caterpillar stage.

What do you call the flexible layer which separates the inside of a cell from the environment? A. nucleus B. ribosomes C. cell membrane D. mitochondria

Which of these is true for bacteria because they are prokaryotic cells a - they can destroy neutrophils b - they are much smaller than lymphocytes c - they can invade macrophages d - they are much larger than killer T cells

What are some non-examples of carbohydrates

A person with type O blood can give genes a. AB. b. AO. c. BO. d. OO.

List the reasons why food chains to not send to exceed 4 links

How do organisms with small genomes, such as escherichia coli, carry out so many different biochemical reactions?