GED Science Unit 1: Life Science Test With Verified Correct Answers Complete Solutions.

scientific theory - correct answer a widely tested and accepted explanation of a set of observations cell membrane - correct answer controls how much water, sugar, sodium, and other substance flow in and out chloroplasts - correct answer where the cell components where photosynthesis take place in plants only mitochondria - correct answer packages energy in a way that cells can use it. ribosomes - correct answer make enzymes and proteins that are important parts of most body structures, such as bone and muscle. nucleus - correct answer the cell component that contains DNA in most types of cells metabolism - correct answer chemical changes that occur in an organism. mitosis - correct answer cell division that are alike in many ways but have important differences and they have very different results. meiosis - correct answer a cell division process that happens in the reproductive organs. gametes - correct answer resulting cell from meiosis such as egg or sperm. zygote - correct answer fertilized egg DNA - correct answer deoxyriboncleic acid-the cell macromolecule that carries genetic information RNA - correct answer ribonucleic acid-a cell macromolecule that helps make protein doninant allele - correct answer the version of a gene that shows up in an organism when it also has a recessive version. recessive allele - correct answer the version of a gene that shows up in an organism only when it has two of the same version. genotype - correct answer the combination of one or more genes for one of more traits phenotype - correct answer an organism's appearance or characteristic that results from the organism's genotype epigenetics - correct answer the study of how phenotypes change when the function, but not the structures, of genes is altered Circulatory System - correct answer made up for the heart, blood vessels, and blood make this system up. Respiratory System - correct answer the lungs make up part of this system. Urinary System - correct answer the kidneys make up this system Muscular System - correct answer many different types of muscle tissue make up this system Skeletal System - correct answer bone and their connections with ligaments and joints make up this system. Nervous System - correct answer the brain, spinal cord and nerves in the spine make this system up and electrical messages throughout this system. Integumentary System - correct answer Skin is the body's largest organ and part of this system. Lymphatic System - correct answer Sometimes called the immune system, contains spleen lymph nodes, lymphocytes and lymph vessels. Reproductive System - correct answer produces sex hormones and sex cells. Male has sperm, female has egg. nutrients - correct answer substance that provide nourishment for the essential functions of life. evolution - correct answer the development of new types of organisms form preexisting types of organisms over time. population - correct answer all the members of a species in one place at a time ecosystem - correct answer a community of living and non-living things and the interactions among them. carrying capacity - correct answer the largest population that an environment can support at any given time. symbiosis - correct answer a relationship in which two different organisms live in close association with each other. biodiversity - correct answer biological diversity, which is a combination of (1) the number of organisms in a species and (2) the number of different species photosynthesis - correct answer Plants use the sun's energy to convert water and carbon dioxide into sugars fertilization - correct answer Process in sexual reproduction in which male and female reproductive cells join to form a new cell endocrine system - correct answer Glands secrete hormones that regulate processes such as growth, reproduction, and nutrient use (metabolism) by body cells. homeostasis - correct answer A tendency to maintain a balanced or constant internal state; the regulation of any aspect of body chemistry, such as blood glucose, around a particular level immune system - correct answer A system (including the thymus and bone marrow and lymphoid tissues) that protects the body from foreign substances and pathogenic organisms by producing the immune response Sensory organs - correct answer Organs for the 5 human senses of sight, taste, touch, hearing and smell. They gather information from outside th