Which of the following is INCORRECT concerning
Radiolarians?
a. They have perforated shells of calcium
carbonate.
b. They form part of the plankton.
c. They use pseudopods for feeding.
d. They have vacuoles that impart buoyancy.
e. They are heterotrophic protists.
Answer: a
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The antiparallel polarity of the two DNA strands within the double helix affects DNA replication in that
A) it takes twice as long to replicate two strands sequentially from 5? to 3?. B) circular bacterial DNA does not have polarity, so a single strand can be copied twice. C) DNA polymerases synthesizing both strands move in the direction of the replication fork, one strand is replicated discontinuously. D) each portion of the double helix must be unwound twice so that both strands are replicated continuously.
Each DNA strand has a backbone that consists of alternating _____
a. amino acids b. nitrogen-containing bases c. hydrogen bonds d. sugar and phosphate molecules e. types of sugars
Which type of reproduction is most adaptive in a rapidly changing environment with many different parasitic diseases present?
A. sexual reproduction, because the diversity of genotypes increases the likelihood that there is one which can survive in a new environment B. asexual reproduction, because the currently successful genotypes can reproduce quickly C. asexual reproduction, because asexual reproduction uses less energy, which leaves more for each individual to adapt to the changing environment D. sexual reproduction, because this type of reproduction allows the production of a greater number of offspring, thus providing more individuals to take advantage of any environmental challenges presented
Elaborate on the idea that proteins are the workhorse molecules of the cell. What will be an ideal response?