Final Bio 20 Exam Saddleback College Example Questions Correctly Solved.

What do plants need to carry on photosynthesis? - correct answer H2O and CO2 Organisms that derive their chemical energy either from process of chemosynthesis or photosynthesis are classified as? - correct answer autotrophs Chlorophyll reflects (doesn't absorb) which color light? - correct answer Green Where in a plant cell is chlorophyll found? - correct answer In the thylakoids The flow of what particle across the thylakoid membrane powers the production of atp? - correct answer hydrogen ions The oxygen released in photosynthesis comes from? - correct answer water An important electron and hydrogen acceptor in photosynthetic pathways of ATP formation is? - correct answer NADP+ Which type of plants are adapted to hot and dry conditions? - correct answer C4 and CAM The Calvin cycle occurs in? - correct answer Stroma Three of the four answers listed below are participants in photosynthesis. Select the exception. A. Photosystem B. Chlorophyll C. Mitochondrion D. Chloroplast - correct answer C. Mitochondrion Three of the four answers listed below are associated with light- independent reactions. Select the exception. A. Uses ATP and NADPH B. Involves RuBP C. Is called the Calvin pathway D. Requires light - correct answer D. Requires light Mendel conducted his most memorable experiments on - correct answer Peas A monohybrid cross is - correct answer A breeding experiment which the cross examines one characteristic Which of the following statements regarding genotypes and phenotypes is false? A. The genetic make up of an organism constitutes its genotype B. An organism with two different alleles for a single trait is said to be homozygous for that trait C. Alleles are alternate forms of a gene D. The expressed physical traits of an organism are called its phenotype. - correct answer The false statement is B. An organism with two different alleles for a single trait is said to be homozygous for that trait. All the offspring of a cross between a black-eyed mendelien and an orange-eyed mendelien have black eyes. This means that the allele for black eyes is ________ the allele for orange eyes. - correct answer dominant to If A is dominant to a and B is dominant to b, what is the expected phenotypic ratio of the cross: AaBb × AaBb? - correct answer 9:3:3:1 Which of the following statements best explains why dominant alleles that cause lethal disorders are less common than recessive alleles that cause lethal disorders? A. Lethal disorders caused by dominant alleles are usually more severe than lethal disorders caused my recessive alleles. B. Unlike lethal disorders caused by recessive alleles, lethal disorders caused by dominant alleles usually cause the death of an embryo. C. Most individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce D. The presence of a lethal dominant allele cause sterility. - correct answer C. Most individuals carrying a lethal dominant allele have the disorder and die before they reproduce, whereas individuals carrying a lethal recessive allele are more likely to be healthy and reproduce. All the offspring of a cross between a red-flowered plant and a white-flowered plant have pink flowers. This means that the allele for red flowers is ________ to the allele for white flowers. - correct answer Incompletely dominant A person with AB blood illustrates the principle of - correct answer codominance Which of the following terms refers to a situation where a single phenotypic character is determined by the additive effects of two or more genes? - correct answer polygenic inheritance What is the normal complement of sex chromosomes in human male? - correct answer one X chromosome and one Y chromosome How many sex chromosomes are in a human gamete? - correct answer one Any gene located on a sex chromosome - correct answer is called a sex-linked gene Recessive X-linked traits are more likely to be expressed in a male fruit fly than a female fruit fly because - correct answer the male's phenotype results entirely from his single X-linked gene. A color-blind woman marries a man who is not color-blind. All of their sons, but none of their daughters, are color-blind. Which of the following statements correctly explains these results? A. The gene for color vision is incompletely dominant to the gene for the sex determination. B. The gene for color vision is codominant with the gene for sex determination. C. The gene for color vision is found on the X chromosome D. The gene for color vision is found on the Y chromosome. - correct answer C. The gene for color vision is found on the x chromosome. Sex-linked conditions are more common in men than in women because - correct answer men need to inherit only one copy of the recessive allele for the condition to be fully expressed When a T2 bacteriophage infects an Escherichia coli cell, which part of the phage enters the bacterial cytoplasm? - correct answer only the DNA The shape of a dna molecule is most like - correct answer a twisted rope ladder Which plants in this figure must all be heterozygous? - correct answer purple-flowered plants in the F1 generation The monomers of dna and rna are - correct answer nucleotides Which of the following statements regarding DNA is false? A. DNA uses the sugar deoxyribose. B. DNA uses the nitrogenous base uracil C. One DNA molecule