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Yeast cells break down glucose anaerobically into A) ethanol and CO2 B) lactic acid and CO2 C) lactic acid and H2O D) ethanol and H2O
The movement of molecules from a region of low concentration across a membrane to a region of high concentration by use of ATP energy is A) active transport B) diffusion C) passive transport D) osmo
Mitochondria A) package proteins for secretion from cell B) contain chromosomes C) are sites of oxidation of glucose to generate ATP D) synthesize proteins
The main function of a ribosome is to A) extract energy from glucose B) synthesize glucose C) store food in the form of fat D) synthesize proteins
Glycerol is a building block of A) starch B) enzymes C) vegetable oil D) DNA
This polysaccharide forms fibers that are a major component of plant cell walls: A) glucose B) starch C) cellulose D) glycogen
A sodium atom has 11 protons, 12 neutrons, and 11 electrons. The atomic number of sodium is A) 11 B) 12 C) 23 D) 34
In science, a hypothesis must be A) a known fact B) derived from a theory C) testable D) able to be proven absolutely true
Explain why top carnivores, such as eagles and tigers, have low population densities in nature. Include processes of the energy pyramid (trophic levels) in your answer.
Describe three structures found in plant cells but not animal cells. Describe the function of each structure, and how each benefits plant cells but is not necessary for animal cells.
Fats contain more energy per gram than carbohydrates or proteins becauseA) fat molecules contain a lower percentage of oxygen atomsB) fat molecules contain a lower percentage of hydrogen atomsC) fat m
Agar and gelatin are used as a solidifying agent for bacteriological media. Why is gelatin less suitable than the agar?
Species diversity is highest when ___________. A. species richness is low and relative abundance is evenly distributed B. species richness is high and relative abundance is unevenly distributed C. spe
The lac repressor is : a) inactive when glucose is present. b) active when glucose is present. c) rarely active. d) active when both glucose and lactose are present. e) induced when cAMP is present.
What is clinical significance of bronchopulmonary segments? What is the arrangement of the three layers of the muscularis externa in the stomach? Which layer is nearest the lumen...which is nearest
What is a testcross? A) a mating between an individual of unknown genotype and an individual homozygous recessive for the trait of interest B) a mating between an individual of unknown genotype and an
Which of the following processes does NOT assist the sperm cell in reaching their destination in the female reproductive tract. (a) musclar contractions along the legth of the male reproductive system
Females of most mammalian species have estrus cycles instead of menstrual cycles. Such females usually come into estrus (also called in heat) only once a year.
Question 1: Photosynthesis is the process of storing energy from the sun - do all the reactions require light to proceed? Question 2: What two chemical elements are required for most presumptive blood
The infective source for amebic dysentery is: A)chickens B)chronically infected persons C)carriers D)all of the above E) only b and c above
The stage in meiosis in which four heploid cells emerge ready to be structurally differentiated into egg or sperm cells? (a) prophase I (b) Telophase II (c)metaphase II (d) telophase I (e) fertiliza
Which two observations led Darwin to conclude that there is competition for survival? A. Natural selection and descent with modification B. Variability and heritability C. Overproduction and limited r
Sickle cell anemia is a extreme example of ... (a) a disease of witch a defective gene has no dominant alleles (b) pleiotropy (c) incomplete dominance (d) epistasis (e) partial dominance
Which of the following choices would best describe the phenotype of Bb individuals (a) big B (b) heterozygous (c) homozygous (d) two alleles (e) F2 individuals