What is the purpose of self-incompatibility in flowers?
a. It prevents both self-fertilization and self-pollination.
b. It prevents self-pollination but not self-fertilization.
c. It prevents self-fertilization but not self-pollination.
d. It prevents self-fertilization and occasionally prevents self-pollination.
Ans: c. It prevents self-fertilization but not self-pollination.
You might also like to view...
Which of the following is the major focus of epidemiologists?
A. Measuring the level of resistance to antimicrobial agents B. The development of methods for disease prevention C. The discovery of factors essential to disease occurrence D. Both the discovery of factors essential to disease occurrence and the development of methods for disease prevention E. Both the discovery of factors essential to disease occurrence and measuring the level of resistance to antimicrobial agents F. Both the development of methods for disease prevention and measuring the level of resistance to antimicrobial agents
The figure illustrates
a. repression of the lactose operon. b. promotion of the lactose operon. c. formation of a repressor molecule. d. attachment of lactose to DNA. e. all of these.
List, in order, the steps usually followed in producing recombinant DNA molecules in a plasmid vector
What will be an ideal response?
A key derived character of sharks and rays that distinguishes them from ray-finned fishes is
A) jaws and a swim bladder. B) vertebrae. C) calcified (hard) bones. D) a skeleton made of cartilage