In the wake of the retreat of a glacier, leaving bare rock and sand, the action of the first colonizing species in this environment to make the area suitable for other species is called
A. secondary succession.
B. climax succession.
C. seral accumulation.
D. facilitation.
E. optimal succession.
D. facilitation.
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This diagram illustrates the action of a proteasome on protein marked with ubiquitin tags. What statement about this process is true?
a. Degradation of proteins results in the destruction of the proteasome.
b. Degradation of proteins in proteasomes produces a net output of energy.
c. Degradation of proteins in proteasomes requires a net input of energy.
d. Proteasomes absorb all non-amino acid components of proteins.
Light travels from space to earth
a. in circle lines. b. in straight lines. c. in waves. d. in circle and straight lines. e. in circle lines and in waves
With respect to the alleles for sickle cell anemia, which genotype(s) is (are) at a disadvantage to persons residing in
tropical areas of Africa? a. heterozygous b. homozygous dominant c. homozygous recessive d. both heterozygous and homozygous dominant e. both homozygous dominant and homozygous recessive
The 3? end of eukaryotic pre-mRNAs are changed by:
a. removing the last phosphate group. b. adding a "cap." c. copying the last few bases so that it can form a duplex structure. d. adding 100?250 adenine nucleotides. e. phosphorylation of the mRNA molecule