In yeast signal transduction, the yeast cells
A) must physically and directly interact.
B) produce signal molecules that change themselves so they can interact with one another.
C) produce response molecules that diffuse to other yeast cells.
D) secrete molecules that result in response by other yeast cells.
E) mate, after which the new cells secrete hybrid signals.
Ans: D) secrete molecules that result in response by other yeast cells.
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The main reason certain seeds germinate near the soil surface rather than deep in the soil is
A. they need additional oxygen. B. they are then more aware of their surroundings. C. they require light to germinate. D. they have water deprivation. E. they are sensitive to the cold temperatures of the soil.
Experiments have shown that even if it is supplied by no other means, plants near the ocean can get enough of the
essential micronutrient ____ from the air, and plants can also get this essential micronutrient from sweat from a person’s hands.
a. sulfur b. manganese c. chlorine d. magnesium e. sodium
In pea plants, the gene for round seeds (R) is dominant, and wrinkled seeds (r) is recessive. The endosperm of the pea is also either starchy, a dominant gene (S), or waxy (s). What can be said of a fully heterozygous, dihybrid cross?
A. Some offspring could be homozygous for both dominant genes. B. Some offspring could be homozygous for one dominant gene such as round seed and homozygous recessive for the other recessive waxy gene. C. Some offspring could be homozygous for both recessive genes. D. All of these choices are impossible combinations in a dihybrid cross. E. All of these choices are possible combinations in a dihybrid cross.
What evidence led to Kirk Odom's freedom after being wrongly imprisoned for 30 years?
A) an analysis of blood types from the crime scene B) an analysis of fingerprints from the crime scene C) accounts from witnesses D) an analysis of DNA from the crime scene