What are base pairing rules?

An object of dead bacteria that stimulates the immune system is called a?

Which observation is inconsistent with Haeckel's idea that "ontogeny recapitulates phylogeny"? Group of answer choices The backbone All tetrapod embryos display pharyngeal clefts, a notochord, segmentation, and paddlelike limb buds.

Which is true for the beginning of the Cenozoic era? A.) Mammals and dinosaurs lived together. B.) Mammals first appeared. C.) Dinosaurs had killed all mammals. D.) Dinosaurs were extinct.

Why is transcription necessary?

Can a cell make a protein directly from a gene?

Salivation is controlled almost entirely by the nervous system. Which of the following stimuli would inhibit salivation? A: nausea B: a lemon C: fear D: the thought of food

How are hormones levels regulated? A. By nerve impulses B. By a feedback loop C. By sexual reproduction D. by involuntary

How many bones in a frog

What is the energy that we see as visible light, and how does the eye transform that energy into neural messages?

What studies how traits are inherited though the interactions of alleles.?