Which type of plant hormone is synthesized mainly in root tips and is apparently transported through
the plant in xylem sap?
a. gibberellins
b. auxins
c. oligosaccharins
d. ethylene
e. cytokinins
E
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According to the principle of segregation, a heterozygous plant with alleles Aa will produce:
A. gametes with only the A allele. B. gametes with only the a allele. C. 50% of gametes with the A allele and 50% of gametes with the a allele, on average. D. gametes in the ratio of 3 A alleles:1 a allele. E. some gametes with the A allele and some with the a allele, but in no predictable ratio.
diverging of a population into two or more species and which figure (above) is best associated with this term?
Speciation can arise through abrupt events, such as changes in chromosome number or as a consequence of adaptation to different ecological niches. What is the term for the splitting or
A. Anagenesis; Figure A.
B. Anagenesis; Figure B.
C. Cladogenesis; Figure A.
D. Cladogenesis; Figure B.
E. Cladogenesis; Both Figure A and B can represent this type of splitting.
Which of the following is a way that antibodies fight infection?
a. They reduce the inflammation response to prevent the body from overheating. b. They engulf and kill pathogens through phagocytosis. c. They bind to pathogens and interfere with the pathogen’s ability to infect or bind to other cells. d. They stimulate a passive response to the presence of a pathogen.
A common characteristic of Choanoflagellida is
A. presence of a plasmodium. B. silica covering. C. space beneath the plasma membrane. D. a single, unique mitochondria. E. funnel-shaped, contractile collar.