Start Discovering Solved Questions and Your Course Assignments
TextBooks Included
Active Tutors
Asked Questions
Answered Questions
What is the advantage to having various types of chlorophylls and accessory pigments for the photosynthetic process? a. It allows for a variation in color amongst plants. b. It shifts the equilibrium
n a chloroplast, the stroma is the: a. Central semifluid region b. Stack of thylakoids c. Region between in the inner and outer membranesn d. Cytochromes associated with the thylakoids e. Connection b
Which of the following statements correctly characterizes the relationship between NADP+/NADPH and NAD+/NADH? a. Both are used extensively during photosynthesis in oxygenic phototrophs. b. Only NAD+/N
The endosymbiotic theory states that mitochondria originated from: a. Purple bacteria entering and remaining in the cytoplasm of another cell. b. A routine step in evolution c. The fusion of several p
Which of the following pigments is found exclusively in red algae? a. Phycoerythrin b. chlorophyll a c. lutein d. ?-carotene
The number of chromosomes in a human sperm cell is A) 4 B) 8 C) 23 D) 46
Which of the following is not a characteristic of enzymes? A) they are proteins B) they speed up the rate of chemical reactions C) they act on specific substances called substrates D) they are used
What happens if a red blood cell is placed in a hypotonic solution? A) the cell will shrink B) the cell will swell and may burst C) the cell will remain the same size
Carbon dioxide is released in A) the light-dependent phase of photosynthesis B) the Krebs cycle C) glycolysis D) the Calvin cycle
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