The flow of energy in the biosphere begins primarily with
A) chemotrophs.
B) phototrophs.
C) lightning.
D) oxidized chemicals.
E) high-energy electrons.
Answer: B
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A true breeding black rabbit is crossed with a true breeding white rabbit. If the black color trait is dominant, which of the following represents the expected phenotype of an F2 generation consisting of 8 individuals?
A. 8 black rabbits, 0 white rabbits, 0 grey rabbits B. 2 black rabbits, 2 white rabbits, 4 grey rabbits C. 0 black rabbits, 0 white rabbits, 8 grey rabbits D. 4 black rabbits, 2 white rabbits, 2 grey rabbits E. 6 black rabbits, 2 white rabbits, 0 grey rabbits
An enzyme
A) decreases the rate of a reaction. B) binds substrates in a manner that facilitates the formation of product. C) changes the position of the equilibrium of the reaction. D) does not change the rate at which the equilibrium is achieved. E) is always a protein.
The figure shows the evolution of HIV and SIV. Choose the true statements about the evolution of HIV. (Select all that apply.)
A) All strains of HIV are included within clades with SIV strains.B) A strain of HIV is never more closely related to another strain of HIV than it is to a SIV strain.C) Humans acquired different subtypes of HIV from different primate hosts.D) HIV-1 group O is more closely related to SIV-chimpanzee than SIV-gorilla.E) All strains of SIV are included within clades with HIV strains.
What will be an ideal response?
Which of the following best describes translation?
A) DNA -> protein B) RNA -> protein C) DNA -> RNA D) RNA -> DNA E) DNA -> DNA