Biology MCAS Questions

Collagen is found is connective tissue throughout the human body. Collagen is made of three amino acid chains that are twisted around each other. What BEST explains why collagen is classified as a protein? - Answer- It is made up of amino acids In tigers, the allele for orange fur is dominant to the allele for white fur. If two heterozygous tigers mate and produce offspring, what is the probability of an individual offspring having white fur? - Answer- 1/4 Information is detected by the eye and sent to the brain by what structures? - Answer- sensory neurons A scientist is trying to determine how closely related two species of plants are. What would be useful for the scientist to compare? - Answer- the genetic sequences of the plants S. epidermis can sometimes infect wounds. The symptoms of the infection include swelling, pain, pus, skin that is warm to the touch, and redness at the infection site. Based on the symptoms, which human body systems work together to restore homeostasis? - Answer- circulatory system and immune system What is a characteristic that distinguishes viruses from B. thetaiotaomicron and S. epidermis? - Answer- viruses are unable to reproduce outside of the host cells. What best explains how antibiotic resistance spreads through some populations of S. epidermidis? - Answer- Some S. epidermidis cells exposed to antibiotics survive and pass their genes on to their offspring What describes one way B. thetaiotaomicron helps in digestion? - Answer- It breaks down polysaccharides into simpler sugars. The human body contains diverse types of bacteria. Scientists estimate that the average healthy adult human body is home to at least 10,000 species of bacteria. In fact, there are about 10 times more bacterial cells than human cells in the human body. Many bacterial populations are important to the normal functioning of human body systems. For example, some bacteria in the digestive system produce substances the human body cannot produce. These substances help the body break down and absorb nutrients. However, bacteria that help the human body in one location can cause serious illness if introduced to a different part of the body. - Answer- Two bacteria found in the human body are B. thetaiotaomicron and S. epidermidis B. thetaiotaomicron - Answer- -typically lives in the small intestine -produces hundreds of enzymes that help break bonds in complex carbohydrates -2nd most frequently encountered Bacteroides -G