Answer the following statements true (T) or false (F)
1. Bacterial capsules protect bacteria from being phagocytized by leukocytes.
2. A headache is a classic example of a sign of a disease.
3. To cause disease, all bacterial pathogens must first attach to some tissue in the body.
4. Rickettsias and chlamydias are examples of obligate intracellular pathogens.
5. Babesia spp., Ehrlichia spp., and Plasmodium spp. are examples of intraerythrocytic pathogens.
1. TRUE
2. FALSE
3. FALSE
4. TRUE
5. FALSE
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Place the following events of fertilization in the correct chronological order.
(1) Sperm contacts the cumulus mass. (2) Proteolytic enzymes are released from the acrosome. (3) Sperm contacts the plasma membrane of the ovum. (4) Sperm passes through the zona pellucida. (5) Sperm increase ATP production. A. 5,1,2,4,3 B. 1,5,4,3,2 C. 1,2,4,3,5 D. 5,2,4,3,1 E. 3,5,2,1,4
Which of the following is a true statement about monocots and eudicots?
a. Monocots have one cotyledon, and eudicots have two cotyledons. b. Monocots have branched veins, and eudicots have parallel veins. c. Monocots have a tap root, and eudicots have a network of roots. d. Monocots include lilies and daisies, and eudicots include grasses.
Populations of different kinds of organisms that interact with one another in a particular place are known as
A. ecosystems. B. communities. C. a biosphere. D. a commune.
What is the advantage of excreting nitrogenous waste in the form of ammonia?
A) Ammonia is less toxic than uric acid. B) Ammonia is less soluble than uric acid. C) Ammonia excretion conserves energy. D) Ammonia does not diffuse across cell membranes.