Definitions 1. a structure that consists of two or more types of tissues that work together to
do the same job
2. made up of neurons, or nerve cells, that carry electrical messages
3. made up of cells that form the body’s structure
4. a group of connected cells that have a similar function
5. takes in oxygen and releases waste gases
6. made up of cells that line body surfaces
7. secretes hormones that regulate other organs and organ systems
8. basic units of structure and function in the human body
9. a hormone that helps cells absorb sugar from the blood
10. process in which organ systems work to maintain a stable internal
environment
11. made up of cells that have the unique ability to contract, or become shorter
12. a group of organs that work together to carry out a complex overall function
Terms
a. cells
b. connective tissue
c. endocrine system
d. epithelial tissue
e. homeostasis
f. insulin
g. muscle tissue

The process by which natural forces move weathered rock and soil brim one place to another is called

Mouse liver cells were homogenized and the homogenate subjected to equilibrium density-gradient centrifugation with sucrose gradients. fractions obtained from these gradients were assayed for marker molecules (i.e., molecules that are limited to specific organelles). the results of these assays are shown in the figure. the marker molecules have the following functions: cytochrome oxidase is an enzyme involved in the process by which atp is formed in the complete aerobic degradation of glucose or fatty acids; ribosomal rna forms part of the protein-synthesizing ribosomes; catalase catalyzes decomposition of hydrogen peroxide; acid phosphatase hydrolysis monophosphoric esters at acid ph; cytidylyltransferase is involved in phospholipid biosynthesis; and amino acid permease aids in transport of amino acids across membranes. a) name the marker molecule and give the number of the fraction that is most enriched for each of the following cell components: lysosomes; peroxisomes; mitochondria; plasma membrane; rough endoplasmic reticulum; smooth endoplasmic reticulum.

Which is the correct order in the scientific process? ask a question ® form a hypothesis ® make an observation ask a question ® make an observation ® form a hypothesis make an observation ® form a hypothesis ® ask a question make an observation ® ask a question ® form a hypothesis