Why do classification systems change over time? A. Scientists find new evidence in their studies. B. Scientists use old methods of classification. C. Scientists repeat experiments and find no changes. D. Scientists find similar evidence to previous work.
How does ATP supply energy for cellular activities? A. by breaking off a phosphate group from its structure B. by releasing the sugar molecule from its structure C. by adding a phosphate group to its structure D. by attaching itself to a glucose molecule
The __________ and __________ are the glands that stimulate reproductive cycles. a. testes . . . thyroid b. testes . . . ovaries c. ovaries . . . thyroid d. ovaries . . . thymus
Which of the following statements about forestry education is true? A.) All educational facilities cover forestry to the same depth. B.) Individuals can pursue doctorates in forestry in any state. C.)Program focus will remain the same from state to state. D.)Some states have greater access to forestry programs than others.
How are proteins distinguished from each other? a. by the amounts of carbon, oxygen, and hydrogen they contain b. by the kinds of fatty acids they contain c. by the kinds of bonds that join their monomers d. by the order of the amino acids that form them?
Koala Bears are a specialist species because they _______. a. only eat eucalyptus leaves b. are marsupials c. live in trees d.
When researchers create __________, they are destroying a piece of the brain. A. holes B. currents C. images D. lesions
Female gametangia are called while male gametangia are called . Squash and tomatoes are vegetables. TRUE or FALSE.
Consider the following events of photosynthesis. 1. Light energy excites electrons. 2. Water molecules are split. 3. NADPH is formed. In which locations do each of these events occur? A) 1. photosystem II 2. photosystem I 3. photosystem I B) 1. photosystem II 2. photosystem II 3. photosystem I C) 1. photosystem I 2. photosystem I 3. photosystem II D) 1. photosystem I 2. photosystem II 3. photosystem II
What does an Open Office or Microsoft Office Wizard do? A. suggests a better way to present your data B. analyzes your data and points out errors C. guides you through the steps to complete a complex task D. adds color and styles to make your data look better
Talking about all things lunar, which of these forms of madness is related to the moon? A) HystericaB) LunacyC) InsanityD) Biebermania
In which of the following can a change be directly observed? A. alleles B. genotypes C. phenotypes D. mutations
1. In your body, why do muscle cells and skin cells look and behave differently? (Points : 1) They have different genes. Their genes are being expressed differently. The same genes are being expressed in both types of cells. There is no similarity in their chromosomes. Question 2. 2. Which genes are present in your liver cells? (Points : 1) All your genes are present in your liver cells. Only the genes needed by your liver cells are present in those cells. Half the number of genes is present in your liver cells.
Nonnative species disrupt the natural variability of an ecosystem. Please select the best answer from the choices provided T F
Which event marks the beginning of DNA replication? A) Formation of replication bubble B) Unwinding of DNA helix C) Formation of replication fork
In which of the following ways are bacteria similar to birds?. . A. They both have cell walls surrounding their cells.. B. They both keep their DNA in a membrane-bound nucleus.. C. They both produce offspring genetically identical to themselves.. D. They both use DNA as their genetic material.
Identify the correct order in which breast cancer develops. mutation of normal cells – tumor growth – invasion of tissues – metastasis – metastatic tumor invasion of tissues – metastasis – mutation of normal cells – tumor growth – metastatic tumor metastasis – mutation of normal cells – invasion of tumors – metastatic tumor – tumor growth
Water is warmed by the sun and ______. then it is cooled and ____. then it is brought back to earth in the form of _____. water and nutrients that are not cycled are stored in _____.
Which best describes arteries and veins? A) Both have valves. B) Both are thick, muscular, and elastic. C) Arteries carry blood back to the heart; veins connect arteries and capillaries. D) Arteries carry blood away from the heart; veins carry blood back to the heart.
The molecular clock indicates that humans and chimpanzees diverged about ____ mya. a. 9 b. 18 c. 25 d. 14
Which statement is a characteristic of a convex lens? A. It absorbs most light. B. It is thickest at the edges. C. It bends light rays inward. D. It is always made of glass.
Unstable atmospheric conditions lead to the formation of lightning and thunder in a. nimbostratus clouds. c. altostratus clouds. b. altocumulus clouds. d. cumulonimbus clouds.