Q: Q: Chloroplasts, chromoplasts, and leucoplasts are all plastids, organelles found in what kind of cells? Read this paragraph and choose the correct option from the provided answers: Plastids are organelles in plant cells that may have various jobs. The main types of plastids are chloroplasts, chromoplasts, and leucoplasts. Choices: - animal cells - lung cells - heart cells - plant cells A:
A: plant cells

Q: Q: Arteries have thinner wall layers and valves and move blood by the action of skeletal what? Read this paragraph and choose the correct option from the provided answers: During the systolic phase of the cardiac cycle, the heart is ________. contracting b. relaxing c. contracting and relaxing d. filling with blood 16. How do arteries differ from veins? a. Arteries have thicker wall layers to accommodate the changes in pressure from the heart. Arteries carry blood. Arteries have thinner wall layers and valves and move blood by the action of skeletal muscle. Arteries are thin walled and are used for gas exchange. Most of the hormones produced by the anterior pituitary perform what function? a. regulate growth b. regulate the sleep cycle c. regulate production of other hormones d. regulate blood volume and blood pressure 18. What is the function of the hormone erythropoietin? a. Choices: - marrow - collagen bands - hormones - muscle A:
A: muscle

Q: Q: What has two chains of nucleotides, one more than rna? Read this paragraph and choose the correct option from the provided answers: RNA consists of just one chain of nucleotides. DNA consists of two chains. Nitrogen bases on the two chains of DNA form hydrogen bonds with each other. Hydrogen bonds are relatively weak bonds that form between a positively charged hydrogen atom in one molecule and a negatively charged atom in another molecule. Hydrogen bonds form only between adenine and thymine, and between guanine and cytosine. These bonds hold the two chains together and give DNA is characteristic double helix, or spiral, shape. Choices: - gna - fna - mna - dna A:
A: dna

Q: Q: In the periodic table, elements are arranged from left to right according to what property? Read this paragraph and choose the correct option from the provided answers: You can see how Mendeleev organized the elements in Figure below . From left to right across each row, elements are arranged by increasing atomic mass. Mendeleev discovered that if he placed eight elements in each row and then continued on to the next row, the columns of the table would contain elements with similar properties. He called the columns groups . They are sometimes called families, because elements within a group are similar but not identical to one another, like people in a family. Choices: - metallic mass - real mass - major mass - atomic mass A:
A: atomic mass