What repeating units make up a protein

A potassium isotope has a half-life of 1.25 billion years. Given that scientists estimate Earth's age to be 4.6 billion years, what is the most likely percentage of parent to daughter isotopes of this element currently existing on Earth? A.

Which of the following serve as enzymes?

When does crossing over occur in meiosis? A prophase 2 B metaphase 2 C metaphase 1 D prophase 1

The data from a replicated experiment are very different from the data obtained during the initial experiment.

What human activity would you have the most significant effect on the temperature of the earth

Does foreskin restoration restore nerves

What is chromatin and what are chromosomes?

Which of following cells don't play endocrine Role a. interstitial cells. B. follicle cells. c. germinal epithelium cells. D. leutal cells

The Permian-Triassic extinction 250 million years ago wiped out about ninety percent of Earth's animal species. Some scientists are predicting a sixth mass extinction in the future, due to A) acid rain. B) air pollution. C) global warming.

Which cell organelles function resembles the function of the brain in higher animals