Which of these conditions are always true of populations evolving due to natural selection? Condition 1: The population must vary in traits that are heritable. Condition 2: Some heritable traits must increase reproductive success
Condition 3: Individuals pass on most traits that they acquire during their lifetime. A) Condition 1 only
B) Condition 2 only
C) Conditions 1 and 2
D) Conditions 2 and 3
C
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Cytotoxic T cells destroy cancerous cells by
A. forming the membrane attack complex. B. releasing vesicles containing perforin. C. activating natural killer cells. D. opsonization. E. secreting cytokines.
The composition of plasma is not fully known due to its complexity
Indicate whether the statement is true or false.
Place the following events in the order in which they occur when cells stop dividing at a G1 checkpoint after the cells have been irradiated.
1. Production of p21. 2. DNA damage. 3. Inactivation of cyclin-Cdk complex. 4. Activation of p53. 5. Activation of ATM/ATR A. 1-2-3-4-5 B. 2-5-4-1-3 C. 2-5-1-3-4 D. 5-4-3-2-1
In studying fossils, biologists found an insect in a layer of clay, a flower in a layer of sand, a fish in a layer of mud, a reptile in a layer of clay, and a bird in a layer of rock. The insect probably lived at the same time as the
A. fish. B. bird. C. flower. D. reptile.