What molecules both enters AND exits the Kreb's cycle?

a. acetyl Co-A

b. citric acid

c. pyruvic acid

d. oxaloacetate

In both the iron sulfide hypothesis and the lipid membrane hypothesis, small, enclosed spaces are suggested as the precursors of the first cells. What benefit do small spaces provide in the formation of organic molecules?

Which of the following needs must be met to achieve sustainability? a. water b. energy c. environmental d. all of the above

What is the complementary sequence to the dna strand 5/' cgatgagcc 3/'? enter the sequence in the 3/' to 5/' direction?

Briefly describe the DNA transcription process which involves the transfer of DNA genetic code onto an mRNA molecule include in this answer the role of enzymes

Ellen began forgetting where she put her purse, how to balance a checkbook, and where she left the car in the parking lot. She is experiencing the signs and symptoms of: Alzheimer's disease. menopause. menarche. old age.

Earthquakes can occur at oceanic transform boundaries but not at continental transform plate boundaries. True False

How would you classify paramecium: animal-like, plant-like or fungus-like and why?

Which conversion is controlled by insulin?

Describe the basic parts and functions of the circulatory system

In animal cells, somatic cells have __set (s) of chromosomes.