T-cell receptors can only recognize antigens on the surfaces of antigen-presenting cells; they cannot bind free antigen.
Answer the following statement true (T) or false (F)
True
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Classical conditioning such as the salivating of Pavlov's dog in response to a metronome is based on a(n)
A. operant condition. B. sign stimulus. C. involuntary response. D. dishabituation. E. None of the choices are correct.
Researchers studying guppies in Trinidad found that guppies, in streams with high predation, reproduce earlier and more frequently. How would the scientists describe the selective force acting on the guppy population?
A. r-selection B. sexual selection C. density-dependent factors D. density-independent factors E. K-selection
In garden peas, one pair of alleles controls the height
of the plant, and a second pair of alleles controls flower color. The allele for tall (D) is dominant to the allele for dwarf (d), and the allele for purple (P) is dominant to the allele for white (p). A tall plant with purple flowers crossed with a dwarf plant with white flowers produces 1/4 tall purple, 1/4 tall white, 1/4 dwarf purple, and 1/4 dwarf white. What is the genotype of the parents? What will be an ideal response?
Which of the following sequences is incorrect?
a. Males: inhibin: secreted by Sertoli cells b. Males: follicle-stimulating hormone: stimulate production of androgen binding protein c. Males: gonadotropin-releasing hormone: stimulate testosterone production d. Females: luteinizing hormone: stimulate ovulation e. Females: inhibin: decreased secretion of FSH