First line of defense may be described as
A) the release of prostaglandins and leukotrienes in response to microbes.
B) intact skin, mucous membranes, sebum, tears, and so forth.
C) damage resulting in cell lysis.
D) the coating of a pathogen by complement.
E) nonspecific leukocytes that secrete toxins onto the surface of virally infected cells.
B
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According to Figure 14.2, the average number of new mutations that occur across an entire human genome in one generation is around ____ times higher than in nematodes
A. 2 B. 10 C. 100 D. 1000 E. 10,000
A hummingbird is attracted to the red, tubular flowers of a trumpet vine. It drinks nectar from the flower and, in doing so, collects pollen that it transfers to the next flower
In this form of communication, who is the sender, who is the receiver, and what information is being transferred? A. The hummingbird is the sender, the flower is the receiver, and the availability of pollen is the information. B. The hummingbird is the sender, the flower is the receiver, and the availability of the hummingbird to transfer pollen is the information. C. The flower is the sender, the hummingbird is the receiver, and the availability of nectar is the information. D. The flower is the sender, the hummingbird is the receiver, and the need of the flower to have its pollen transferred is the information. E. The flower is the sender, the pollen is the receiver, and the presence of the hummingbird is the information.
Which molecule contains more energy?
a. ATP b. ADP
A woman was told by her doctor that while she is pregnant, she might want to let someone else care for her cats so she would not contract toxoplasmosis. What is the mechanism of transmission of toxoplasmosis?
A. infection from mice the cat may bring into the house B. exposure to infected cat feces C. infection from saliva D. scratches from infected claws E. flea bites transmit the organism