Astudent viewing a cell with a microscop observes a cell wall, a cell membrane, and a nucleus. the presence of these structures indicates that the student is looking at a a (1) rabbit (3) worm (2) carrot (4) fly

What is a photon? a. part of a ribosome b. a light particle c. a carbon dioxide molecule d. part of a chloroplast b. a light particle

Which of the following statements is true regarding a basic amino acid? a.) the hydrophilic r group of a basic amino acid will be located on the interior of a protein b.) the positively charged r group of a basic amino acid could bind dna c.) the r group of a basic amino acid would only be able to form covalent bonds with other molecules d.) a basic amino acid would be considered both polar and hydrophobic e.) all of the above

Which muscle cell structure stores calcium ions that are used to trigger the contraction?