Which of the following is a protein essential for regulating gene expression?

A. transcription factors

B. operator genes

C. promoter genes

D. structural genes

Why did Mendel use pea plants in his experiments? O A. They are haploid organisms. B. They have no dominant traits. C. They produce many offspring. O D. They are all male.

Organs, such as the stomach and the small and large intestines, are lined with smooth muscle tissue. These organs, due to the muscular contractions of their walls, involuntarily A) grind food into smaller pieces.

A unicellular organism that has a nucleus, a cell wall, and the ability to produce spores?

The medical term that means without feeling or without sensation is:

Mitochondria are responsible for providing () for the cell. Aerobic respiration happens in the mitochondria.

Drag each label to the correct location on the diagram. Each label can be used more than once. An incomplete diagram of the rock cycle is shown below. Use the labels to correctly complete the diagram

Deepest place in the seafloor is called the

Monohybrid cross is made between plants that

Which statement best describes an aerobic heterotroph

What disease disables the bodys immune system?