What is the mechanism by which synthetic auxins are routinely used to control weeds?
A. They cause the plant cell wall to disintegrate.
B. They interfere with DNA synthesis in the cell.
C. They interfere with protein synthesis in the cell.
D. They cause weeds to grow so fast they reduce their ATP production, so no energy is left for other essential plant functions.
E. They disrupt the plasma membrane of plant cells, causing them to leak and die.
Answer: D
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Genomic studies of Neanderthals, modern humans, and chimpanzees confirms which of the following?
A. Humans evolved from Neanderthals. B. Humans and Neanderthals interbred. C. Humans and Neanderthals are not closely related. D. Humans and Neanderthals both evolved from chimpanzees. E. More than one of these is confirmed by the genomic comparisons.
Many human traits, such as our performance on intelligence tests or our susceptibility to heart disease, are ________
A) determined only by our genes B) influenced by both genes and the environment C) determined by genes in some people and by the environment in other people D) not affected by our genes
Prokaryotic cells divide by a process known as
A. conjugation. B. mitosis. C. binary fusion. D. binary fission.
Natural selection can only act on traits that
a) are adaptive b) reduce mortality c) are heritable d) are acquired in an individual's lifetime e) confer a reproductive advantage