Match the letter of each example from childbirth to the appropriate component of a positive feedback loop.A. Pituitary gland secretes oxytocin, which acts on the uterusB. Uterine contractions increaseC. Fetus is pushed against uterine openingD. Receptors detect stretchE. Brain receives and compares stretch informationStimulus
What will be an ideal response?
C
C. fetus is pushed against uterine opening
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With respect to orthomyxoviruses, changes in antigenicity usually occur as a result of
A. frameshift mutations. B. antigenic shift. C. antigenic drift. D. both antigenic drift and antigenic shift. E. both antigenic drift and frameshift mutations. F. both antigenic shift and frameshift mutations.
Which gamete genotypes are expected to contribute to viable offspring when an individual is heterozygous for a pericentric inversion and crossing-over occurs as shown in the diagram? (The ? symbol represents a centromere.)(Select all that apply.)
A) ? A B C D E
B) ? A B C d a ?
C) ? a d c b e
D) e b c D E
E) ? A B C d e
F) A B C ? d a
G) e b c ? D E
H) A B C ? D E
J) a d ? c b e
A farmer noticed that two of her cotton plants produce cotton with a slight greenish hue. By repeatedly crossing the greenish plants, she has produced a variety of deep-green cotton without the use of any dyes. This is an example of
A) convergent evolution. B) natural selection. C) artificial mutation. D) artificial selection. E) inheritance of acquired characteristics.
What feature of mycobacteria is responsible for the unusually slow growth of these bacteria?
A) Their low tolerance for oxygen retards their growth. B) They cannot fully metabolize carbohydrates and must rely on fermentation. C) They have limited numbers of ribosomes so protein production is slow. D) The mycolic acid in their cell walls requires signification metabolic investment. E) They lack a cell wall and are extremely fragile.