A person has a genetic disease that prevents the phospholipids in the plasma membrane of the white
blood cells from freely fusing with the other membranes within the cell. How would this disease affect
phagocytosis?
a. Lysosomes would not be formed.
b. Facilitated diffusion would not occur.
c. Lysosomes would be formed lacking hydrolytic enzymes.
d. The phagocytic vacuole would not fuse with the lysosome.
e. Endocytosis would not occur
D
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Two species cannot occupy the same niche because of which of the following?
a. communalistic principle b. endosymbiotic principle c. competitive exclusion principle d. intraspecific competition principle
A microbiologist has discovered what she thinks are two new types of photosynthetic cells
The first cell (organism 1) appears nearly cubic and is approximately 1.5 ?m wide × 1.5 ?m long × 1.5 ?m deep. The second, larger cell (organism 2) is 5 ?m wide × 15 ?m long × 2 ?m deep. a. What is the surface area/volume ratio of each organism? b. Based on what you know about the surface area/volume ratios, which organism will find it more difficult to interact with the surrounding environment? c. Suggest possible strategies that might allow the organism identified it part (b) to cope with its reduced capacity to interact with the environment. d. Which of these organisms is more likely to be a prokaryote? What will be an ideal response?
Usually, a virus infects a cell and arrests the normal synthetic activities of the host, redirecting the cell to use its available materials to manufacture viral nucleic acids and proteins, which assemble into new viruses. Ultimately, the infected cell ruptures and releases a new generation of viral particles that can infect neighboring cells. This type of infection is called a(n) _________ infection.
A) eluctable B) lytic C) avirulent D) proviral E) virulent
What is the function of antidiuretic hormone (ADH) in the body?
a. During times of increased solute concentrations, ADH causes nephrons to absorb water faster. b. During times of higher solute concentrations, ADH causes more water to be released from the nephrons to be reabsorbed by the blood. c. Low levels or the absence of ADH in the blood are the brain's response to thirst. d. ADH is the only hormone that provides a system of control over the kidney as an osmoregulator for urine production. e. ADH controls the rate that filtrate moves from the glomerulus into Bowman's capsule.